diff --git a/modules/benchpress/benchpress.es6 b/modules/benchpress/benchpress.es6
index 6db01a4c9f..7b1f0f23f2 100644
--- a/modules/benchpress/benchpress.es6
+++ b/modules/benchpress/benchpress.es6
@@ -1,14 +1,18 @@
 import { bind } from 'angular2/di';
-import { JsonFileReporter } from './common';
+import { Options } from './common';
 
 export * from './common';
 export { SeleniumWebDriverAdapter } from './src/webdriver/selenium_webdriver_adapter';
 
 var fs = require('fs');
 
-// Note: Can't do the `require` call in a facade as it can't be loaded into the browser!
-JsonFileReporter.BINDINGS.push(
-  bind(JsonFileReporter.WRITE_FILE).toValue(writeFile)
+// TODO(tbosch): right now we bind the `writeFile` method
+// in benchpres/benchpress.es6. This does not work for Dart,
+// find another way...
+// Note: Can't do the `require` call in a facade as it can't be loaded into the browser
+// for our unit tests via karma.
+Options.DEFAULT_BINDINGS.push(
+  bind(Options.WRITE_FILE).toValue(writeFile)
 );
 
 function writeFile(filename, content) {
diff --git a/modules/benchpress/common.js b/modules/benchpress/common.js
index a4df855c08..0da19f38f2 100644
--- a/modules/benchpress/common.js
+++ b/modules/benchpress/common.js
@@ -2,7 +2,7 @@ export { Sampler, SampleState } from './src/sampler';
 export { Metric } from './src/metric';
 export { Validator } from './src/validator';
 export { Reporter } from './src/reporter';
-export { WebDriverExtension } from './src/web_driver_extension';
+export { WebDriverExtension, PerfLogFeatures } from './src/web_driver_extension';
 export { WebDriverAdapter } from './src/web_driver_adapter';
 export { SizeValidator } from './src/validator/size_validator';
 export { RegressionSlopeValidator } from './src/validator/regression_slope_validator';
@@ -13,7 +13,7 @@ export { PerflogMetric } from './src/metric/perflog_metric';
 export { ChromeDriverExtension } from './src/webdriver/chrome_driver_extension';
 export { IOsDriverExtension } from './src/webdriver/ios_driver_extension';
 export { Runner } from './src/runner';
-export { Options } from './src/sample_options';
+export { Options } from './src/common_options';
 export { MeasureValues } from './src/measure_values';
 export { MultiMetric } from './src/metric/multi_metric';
 export { MultiReporter } from './src/reporter/multi_reporter';
diff --git a/modules/benchpress/src/sample_options.js b/modules/benchpress/src/common_options.js
similarity index 73%
rename from modules/benchpress/src/sample_options.js
rename to modules/benchpress/src/common_options.js
index b2c9801ae9..8af9df3825 100644
--- a/modules/benchpress/src/sample_options.js
+++ b/modules/benchpress/src/common_options.js
@@ -1,6 +1,8 @@
 import { bind, OpaqueToken } from 'angular2/di';
+import { DateWrapper } from 'angular2/src/facade/lang';
 
 export class Options {
+  static get DEFAULT_BINDINGS() { return _DEFAULT_BINDINGS; }
   // TODO(tbosch): use static initializer when our transpiler supports it
   static get SAMPLE_ID() { return _SAMPLE_ID; }
   // TODO(tbosch): use static initializer when our transpiler supports it
@@ -23,6 +25,10 @@ export class Options {
    * Used for micro benchmarks.
    **/
   static get MICRO_ITERATIONS() { return _MICRO_ITERATIONS; }
+  // TODO(tbosch): use static initializer when our transpiler supports it
+  static get NOW() { return _NOW; }
+  // TODO(tbosch): use static values when our transpiler supports them
+  static get WRITE_FILE() { return _WRITE_FILE; }
 }
 
 var _SAMPLE_ID = new OpaqueToken('Options.sampleId');
@@ -34,3 +40,13 @@ var _EXECUTE = new OpaqueToken('Options.execute');
 var _CAPABILITIES = new OpaqueToken('Options.capabilities');
 var _USER_AGENT = new OpaqueToken('Options.userAgent');
 var _MICRO_ITERATIONS = new OpaqueToken('Options.microIterations');
+var _NOW = new OpaqueToken('Options.now');
+var _WRITE_FILE = new OpaqueToken('Options.writeFile');
+
+var _DEFAULT_BINDINGS = [
+  bind(_DEFAULT_DESCRIPTION).toValue({}),
+  bind(_SAMPLE_DESCRIPTION).toValue({}),
+  bind(_FORCE_GC).toValue(false),
+  bind(_PREPARE).toValue(false),
+  bind(_NOW).toValue( () => DateWrapper.now() )
+];
\ No newline at end of file
diff --git a/modules/benchpress/src/metric/perflog_metric.js b/modules/benchpress/src/metric/perflog_metric.js
index aa4bce4788..867a675adb 100644
--- a/modules/benchpress/src/metric/perflog_metric.js
+++ b/modules/benchpress/src/metric/perflog_metric.js
@@ -3,9 +3,9 @@ import { isPresent, isBlank, int, BaseException, StringWrapper, Math } from 'ang
 import { ListWrapper, StringMap, StringMapWrapper } from 'angular2/src/facade/collection';
 import { bind, OpaqueToken } from 'angular2/di';
 
-import { WebDriverExtension } from '../web_driver_extension';
+import { WebDriverExtension, PerfLogFeatures } from '../web_driver_extension';
 import { Metric } from '../metric';
-import { Options } from '../sample_options';
+import { Options } from '../common_options';
 
 /**
  * A metric that reads out the performance log
@@ -21,6 +21,7 @@ export class PerflogMetric extends Metric {
   _measureCount:int;
   _setTimeout:Function;
   _microIterations:int;
+  _perfLogFeatures:PerfLogFeatures;
 
   /**
    * @param driverExtension
@@ -35,19 +36,24 @@ export class PerflogMetric extends Metric {
     this._measureCount = 0;
     this._setTimeout = setTimeout;
     this._microIterations = microIterations;
+    this._perfLogFeatures = driverExtension.perfLogFeatures();
   }
 
   describe():StringMap {
     var res = {
-      'script': 'script execution time in ms',
-      'render': 'render time in ms',
-      'gcTime': 'gc time in ms',
-      'gcAmount': 'gc amount in kbytes',
-      'majorGcTime': 'time of major gcs in ms',
-      'majorGcAmount': 'amount of major gcs in kbytes'
+      'scriptTime': 'script execution time in ms, including gc and render',
+      'pureScriptTime': 'script execution time in ms, without gc nor render'
     };
+    if (this._perfLogFeatures.render) {
+      res['renderTime'] = 'render time in and ouside of script in ms';
+    }
+    if (this._perfLogFeatures.gc) {
+      res['gcTime'] = 'gc time in and ouside of script in ms';
+      res['gcAmount'] = 'gc amount in kbytes';
+      res['majorGcTime'] = 'time of major gcs in ms';
+    }
     if (this._microIterations > 0) {
-      res['scriptMicroAvg'] = 'average script time for a micro iteration';
+      res['microScriptTimeAvg'] = 'average script time for a micro iteration';
     }
     return res;
   }
@@ -120,17 +126,22 @@ export class PerflogMetric extends Metric {
 
   _aggregateEvents(events, markName) {
     var result = {
-      'script': 0,
-      'render': 0,
-      'gcTime': 0,
-      'gcAmount': 0,
-      'majorGcTime': 0,
-      'majorGcAmount': 0
+      'scriptTime': 0,
+      'pureScriptTime': 0
     };
+    if (this._perfLogFeatures.gc) {
+      result['gcTime'] = 0;
+      result['majorGcTime'] = 0;
+      result['gcAmount'] = 0;
+    }
+    if (this._perfLogFeatures.render) {
+      result['renderTime'] = 0;
+    }
 
     var markStartEvent = null;
     var markEndEvent = null;
     var gcTimeInScript = 0;
+    var renderTimeInScript = 0;
 
     var intervalStarts = {};
     events.forEach( (event) => {
@@ -149,26 +160,30 @@ export class PerflogMetric extends Metric {
           var duration = event['ts'] - startEvent['ts'];
           intervalStarts[name] = null;
           if (StringWrapper.equals(name, 'gc')) {
-            var amount = (startEvent['args']['usedHeapSize'] - event['args']['usedHeapSize']) / 1000;
             result['gcTime'] += duration;
+            var amount = (startEvent['args']['usedHeapSize'] - event['args']['usedHeapSize']) / 1000;
             result['gcAmount'] += amount;
             var majorGc = event['args']['majorGc'];
             if (isPresent(majorGc) && majorGc) {
               result['majorGcTime'] += duration;
-              result['majorGcAmount'] += amount;
             }
             if (isPresent(intervalStarts['script'])) {
               gcTimeInScript += duration;
             }
-          } else if (StringWrapper.equals(name, 'script') || StringWrapper.equals(name, 'render')) {
-            result[name] += duration;
+          } else if (StringWrapper.equals(name, 'render')) {
+            result['renderTime'] += duration;
+            if (isPresent(intervalStarts['script'])) {
+              renderTimeInScript += duration;
+            }
+          } else if (StringWrapper.equals(name, 'script')) {
+            result['scriptTime'] += duration;
           }
         }
       }
     });
-    result['script'] -= gcTimeInScript;
+    result['pureScriptTime'] = result['scriptTime'] - gcTimeInScript - renderTimeInScript;
     if (this._microIterations > 0) {
-      result['scriptMicroAvg'] = result['script'] / this._microIterations;
+      result['microScriptTimeAvg'] = result['scriptTime'] / this._microIterations;
     }
     return isPresent(markStartEvent) && isPresent(markEndEvent) ? result : null;
   }
@@ -183,7 +198,8 @@ var _MARK_NAME_PREFIX = 'benchpress';
 var _SET_TIMEOUT = new OpaqueToken('PerflogMetric.setTimeout');
 var _BINDINGS = [
   bind(PerflogMetric).toFactory(
-    (driverExtension, setTimeout, microIterations) => new PerflogMetric(driverExtension, setTimeout, microIterations),
+    (driverExtension, setTimeout, microIterations) =>
+      new PerflogMetric(driverExtension, setTimeout, microIterations),
     [WebDriverExtension, _SET_TIMEOUT, Options.MICRO_ITERATIONS]
   ),
   bind(_SET_TIMEOUT).toValue( (fn, millis) => PromiseWrapper.setTimeout(fn, millis) ),
diff --git a/modules/benchpress/src/reporter/json_file_reporter.js b/modules/benchpress/src/reporter/json_file_reporter.js
index f431dea2a9..d1ccf50bb1 100644
--- a/modules/benchpress/src/reporter/json_file_reporter.js
+++ b/modules/benchpress/src/reporter/json_file_reporter.js
@@ -7,16 +7,12 @@ import { bind, OpaqueToken } from 'angular2/di';
 import { Reporter } from '../reporter';
 import { SampleDescription } from '../sample_description';
 import { MeasureValues } from '../measure_values';
+import { Options } from '../common_options';
 
 /**
  * A reporter that writes results into a json file.
- * TODO(tbosch): right now we bind the `writeFile` method
- * in benchpres/benchpress.es6. This does not work for Dart,
- * find another way...
  */
 export class JsonFileReporter extends Reporter {
-  // TODO(tbosch): use static values when our transpiler supports them
-  static get WRITE_FILE() { return _WRITE_FILE; }
   // TODO(tbosch): use static values when our transpiler supports them
   static get PATH() { return _PATH; }
   static get BINDINGS() { return _BINDINGS; }
@@ -24,12 +20,14 @@ export class JsonFileReporter extends Reporter {
   _writeFile:Function;
   _path:string;
   _description:SampleDescription;
+  _now:Function;
 
-  constructor(sampleDescription, path, writeFile) {
+  constructor(sampleDescription, path, writeFile, now) {
     super();
     this._description = sampleDescription;
     this._path = path;
     this._writeFile = writeFile;
+    this._now = now;
   }
 
   reportMeasureValues(measureValues:MeasureValues):Promise {
@@ -42,17 +40,16 @@ export class JsonFileReporter extends Reporter {
       'completeSample': completeSample,
       'validSample': validSample
     });
-    var filePath = `${this._path}/${this._description.id}_${DateWrapper.toMillis(DateWrapper.now())}.json`;
+    var filePath = `${this._path}/${this._description.id}_${DateWrapper.toMillis(this._now())}.json`;
     return this._writeFile(filePath, content);
   }
 }
 
-var _WRITE_FILE = new OpaqueToken('JsonFileReporter.writeFile');
 var _PATH = new OpaqueToken('JsonFileReporter.path');
 var _BINDINGS = [
   bind(JsonFileReporter).toFactory(
-    (sampleDescription, path, writeFile) => new JsonFileReporter(sampleDescription, path, writeFile),
-    [SampleDescription, _PATH, _WRITE_FILE]
+    (sampleDescription, path, writeFile, now) => new JsonFileReporter(sampleDescription, path, writeFile, now),
+    [SampleDescription, _PATH, Options.WRITE_FILE, Options.NOW]
   ),
   bind(_PATH).toValue('.')
 ];
diff --git a/modules/benchpress/src/runner.js b/modules/benchpress/src/runner.js
index 35a6c3d892..6425e2469d 100644
--- a/modules/benchpress/src/runner.js
+++ b/modules/benchpress/src/runner.js
@@ -18,7 +18,7 @@ import { SampleDescription } from './sample_description';
 import { WebDriverAdapter } from './web_driver_adapter';
 import { Reporter } from './reporter';
 import { Metric } from './metric';
-import { Options } from './sample_options';
+import { Options } from './common_options';
 
 /**
  * The Runner is the main entry point for executing a sample run.
@@ -56,6 +56,7 @@ export class Runner {
 }
 
 var _DEFAULT_BINDINGS = [
+  Options.DEFAULT_BINDINGS,
   Sampler.BINDINGS,
   ConsoleReporter.BINDINGS,
   RegressionSlopeValidator.BINDINGS,
diff --git a/modules/benchpress/src/sample_description.js b/modules/benchpress/src/sample_description.js
index 773ecda8ae..56949d36ce 100644
--- a/modules/benchpress/src/sample_description.js
+++ b/modules/benchpress/src/sample_description.js
@@ -2,7 +2,7 @@ import { StringMapWrapper, ListWrapper, StringMap } from 'angular2/src/facade/co
 import { bind, OpaqueToken } from 'angular2/di';
 import { Validator } from './validator';
 import { Metric } from './metric';
-import { Options } from './sample_options';
+import { Options } from './common_options';
 
 /**
  * SampleDescription merges all available descriptions about a sample
@@ -47,7 +47,5 @@ var _BINDINGS = [
       Metric, Options.SAMPLE_ID, Options.FORCE_GC, Options.USER_AGENT,
       Validator, Options.DEFAULT_DESCRIPTION, Options.SAMPLE_DESCRIPTION
     ]
-  ),
-  bind(Options.DEFAULT_DESCRIPTION).toValue({}),
-  bind(Options.SAMPLE_DESCRIPTION).toValue({})
+  )
 ];
diff --git a/modules/benchpress/src/sampler.js b/modules/benchpress/src/sampler.js
index d43fd304ae..5f7a0d27dc 100644
--- a/modules/benchpress/src/sampler.js
+++ b/modules/benchpress/src/sampler.js
@@ -9,7 +9,7 @@ import { Reporter } from './reporter';
 import { WebDriverExtension } from './web_driver_extension';
 import { WebDriverAdapter } from './web_driver_adapter';
 
-import { Options } from './sample_options';
+import { Options } from './common_options';
 import { MeasureValues} from './measure_values';
 
 /**
@@ -23,8 +23,6 @@ import { MeasureValues} from './measure_values';
 export class Sampler {
   // TODO(tbosch): use static values when our transpiler supports them
   static get BINDINGS() { return _BINDINGS; }
-  // TODO(tbosch): use static values when our transpiler supports them
-  static get TIME() { return _TIME; }
 
   _driver:WebDriverAdapter;
   _driverExtension:WebDriverExtension;
@@ -34,14 +32,14 @@ export class Sampler {
   _forceGc:boolean;
   _prepare:Function;
   _execute:Function;
-  _time:Function;
+  _now:Function;
 
   constructor({
-    driver, driverExtension, metric, reporter, validator, forceGc, prepare, execute, time
+    driver, driverExtension, metric, reporter, validator, forceGc, prepare, execute, now
   }:{
     driver: WebDriverAdapter,
     driverExtension: WebDriverExtension, metric: Metric, reporter: Reporter,
-    validator: Validator, prepare: Function, execute: Function, time: Function
+    validator: Validator, prepare: Function, execute: Function, now: Function
   }={}) {
     this._driver = driver;
     this._driverExtension = driverExtension;
@@ -51,7 +49,7 @@ export class Sampler {
     this._forceGc = forceGc;
     this._prepare = prepare;
     this._execute = execute;
-    this._time = time;
+    this._now = now;
   }
 
   sample():Promise<SampleState> {
@@ -96,7 +94,7 @@ export class Sampler {
   }
 
   _report(state:SampleState, metricValues:StringMap):Promise<SampleState> {
-    var measureValues = new MeasureValues(state.completeSample.length, this._time(), metricValues);
+    var measureValues = new MeasureValues(state.completeSample.length, this._now(), metricValues);
     var completeSample = ListWrapper.concat(state.completeSample, [measureValues]);
     var validSample = this._validator.validate(completeSample);
     var resultPromise = this._reporter.reportMeasureValues(measureValues);
@@ -118,11 +116,9 @@ export class SampleState {
   }
 }
 
-var _TIME = new OpaqueToken('Sampler.time');
-
 var _BINDINGS = [
   bind(Sampler).toFactory(
-    (driver, driverExtension, metric, reporter, validator, forceGc, prepare, execute, time) => new Sampler({
+    (driver, driverExtension, metric, reporter, validator, forceGc, prepare, execute, now) => new Sampler({
       driver: driver,
       driverExtension: driverExtension,
       reporter: reporter,
@@ -134,14 +130,11 @@ var _BINDINGS = [
       // special null object, which is expensive.
       prepare: prepare !== false ? prepare : null,
       execute: execute,
-      time: time
+      now: now
     }),
     [
       WebDriverAdapter, WebDriverExtension, Metric, Reporter, Validator,
-      Options.FORCE_GC, Options.PREPARE, Options.EXECUTE, _TIME
+      Options.FORCE_GC, Options.PREPARE, Options.EXECUTE, Options.NOW
     ]
-  ),
-  bind(Options.FORCE_GC).toValue(false),
-  bind(Options.PREPARE).toValue(false),
-  bind(_TIME).toValue( () => DateWrapper.now() )
+  )
 ];
diff --git a/modules/benchpress/src/validator/regression_slope_validator.js b/modules/benchpress/src/validator/regression_slope_validator.js
index 3143a896f5..6960b839d4 100644
--- a/modules/benchpress/src/validator/regression_slope_validator.js
+++ b/modules/benchpress/src/validator/regression_slope_validator.js
@@ -65,5 +65,5 @@ var _BINDINGS = [
     [_SAMPLE_SIZE, _METRIC]
   ),
   bind(_SAMPLE_SIZE).toValue(10),
-  bind(_METRIC).toValue('script')
+  bind(_METRIC).toValue('scriptTime')
 ];
diff --git a/modules/benchpress/src/web_driver_extension.js b/modules/benchpress/src/web_driver_extension.js
index b2849c6dfc..9d70a3c2a1 100644
--- a/modules/benchpress/src/web_driver_extension.js
+++ b/modules/benchpress/src/web_driver_extension.js
@@ -1,10 +1,10 @@
 import { bind, Injector, OpaqueToken } from 'angular2/di';
 
-import { BaseException, ABSTRACT, isBlank } from 'angular2/src/facade/lang';
+import { BaseException, ABSTRACT, isBlank, isPresent } from 'angular2/src/facade/lang';
 import { Promise, PromiseWrapper } from 'angular2/src/facade/async';
 import { List, ListWrapper, StringMap } from 'angular2/src/facade/collection';
 
-import { Options } from './sample_options';
+import { Options } from './common_options';
 
 /**
  * A WebDriverExtension implements extended commands of the webdriver protocol
@@ -64,9 +64,23 @@ export class WebDriverExtension {
     throw new BaseException('NYI');
   }
 
+  perfLogFeatures():PerfLogFeatures {
+    throw new BaseException('NYI');
+  }
+
   supports(capabilities:StringMap):boolean {
     return true;
   }
 }
 
+export class PerfLogFeatures {
+  render:boolean;
+  gc:boolean;
+
+  constructor({render, gc} = {}) {
+    this.render = isPresent(render) && render;
+    this.gc = isPresent(gc) && gc;
+  }
+}
+
 var _CHILDREN = new OpaqueToken('WebDriverExtension.children');
diff --git a/modules/benchpress/src/webdriver/chrome_driver_extension.js b/modules/benchpress/src/webdriver/chrome_driver_extension.js
index aa3ab0ebb0..19956f16d1 100644
--- a/modules/benchpress/src/webdriver/chrome_driver_extension.js
+++ b/modules/benchpress/src/webdriver/chrome_driver_extension.js
@@ -4,7 +4,7 @@ import {
   Json, isPresent, isBlank, RegExpWrapper, StringWrapper, BaseException, NumberWrapper
 } from 'angular2/src/facade/lang';
 
-import { WebDriverExtension } from '../web_driver_extension';
+import { WebDriverExtension, PerfLogFeatures } from '../web_driver_extension';
 import { WebDriverAdapter } from '../web_driver_adapter';
 import { Promise } from 'angular2/src/facade/async';
 
@@ -111,6 +111,13 @@ export class ChromeDriverExtension extends WebDriverExtension {
     return normalizedEvents;
   }
 
+  perfLogFeatures():PerfLogFeatures {
+    return new PerfLogFeatures({
+      render: true,
+      gc: true
+    });
+  }
+
   supports(capabilities:StringMap):boolean {
     return StringWrapper.equals(capabilities['browserName'].toLowerCase(), 'chrome');
   }
diff --git a/modules/benchpress/src/webdriver/ios_driver_extension.js b/modules/benchpress/src/webdriver/ios_driver_extension.js
index fdd2f5fac2..80d92d23a7 100644
--- a/modules/benchpress/src/webdriver/ios_driver_extension.js
+++ b/modules/benchpress/src/webdriver/ios_driver_extension.js
@@ -1,10 +1,10 @@
 import { bind } from 'angular2/di';
 import { ListWrapper, StringMap } from 'angular2/src/facade/collection';
 import {
-  Json, isPresent, isBlank, RegExpWrapper, StringWrapper
+  Json, isPresent, isBlank, RegExpWrapper, StringWrapper, BaseException
 } from 'angular2/src/facade/lang';
 
-import { WebDriverExtension } from '../web_driver_extension';
+import { WebDriverExtension, PerfLogFeatures } from '../web_driver_extension';
 import { WebDriverAdapter } from '../web_driver_adapter';
 import { Promise } from 'angular2/src/facade/async';
 
@@ -21,7 +21,7 @@ export class IOsDriverExtension extends WebDriverExtension {
   }
 
   gc() {
-    return this._driver.executeScript('window.gc()');
+    throw new BaseException('Force GC is not supported on iOS');
   }
 
   timeBegin(name:string):Promise {
@@ -81,14 +81,8 @@ export class IOsDriverExtension extends WebDriverExtension {
         StringWrapper.equals(type, 'CompositeLayers')) {
         ListWrapper.push(events, createStartEvent('render', startTime));
         endEvent = createEndEvent('render', endTime);
-      } else if (StringWrapper.equals(type, 'GCEvent')) {
-        ListWrapper.push(events, createStartEvent('gc', startTime, {
-          'usedHeapSize': 0
-        }));
-        endEvent = createEndEvent('gc', endTime, {
-          'usedHeapSize': -data['usedHeapSizeDelta']
-        });
       }
+      // Note: ios used to support GCEvent up until iOS 6 :-(
       if (isPresent(record['children'])) {
         this._convertPerfRecordsToEvents(record['children'], events);
       }
@@ -99,6 +93,12 @@ export class IOsDriverExtension extends WebDriverExtension {
     return events;
   }
 
+  perfLogFeatures():PerfLogFeatures {
+    return new PerfLogFeatures({
+      render: true
+    });
+  }
+
   supports(capabilities:StringMap):boolean {
     return StringWrapper.equals(capabilities['browserName'].toLowerCase(), 'safari');
   }
diff --git a/modules/benchpress/test/metric/perflog_metric_spec.js b/modules/benchpress/test/metric/perflog_metric_spec.js
index f385d858a8..e3786ffb38 100644
--- a/modules/benchpress/test/metric/perflog_metric_spec.js
+++ b/modules/benchpress/test/metric/perflog_metric_spec.js
@@ -13,9 +13,13 @@ import {
 
 import { List, ListWrapper } from 'angular2/src/facade/collection';
 import { PromiseWrapper, Promise } from 'angular2/src/facade/async';
-import { isPresent } from 'angular2/src/facade/lang';
+import { isPresent, isBlank } from 'angular2/src/facade/lang';
 
-import { Metric, PerflogMetric, WebDriverExtension, bind, Injector, Options } from 'benchpress/common';
+import {
+  Metric, PerflogMetric, WebDriverExtension,
+  PerfLogFeatures,
+  bind, Injector, Options
+} from 'benchpress/common';
 
 import { TraceEventFactory } from '../trace_event_factory';
 
@@ -23,15 +27,19 @@ export function main() {
   var commandLog;
   var eventFactory = new TraceEventFactory('timeline', 'pid0');
 
-  function createMetric(perfLogs, microIterations = 0) {
+  function createMetric(perfLogs, microIterations = 0, perfLogFeatures = null) {
     commandLog = [];
+    if (isBlank(perfLogFeatures)) {
+      perfLogFeatures = new PerfLogFeatures({render: true, gc: true});
+    }
     var bindings = [
+      Options.DEFAULT_BINDINGS,
       PerflogMetric.BINDINGS,
       bind(PerflogMetric.SET_TIMEOUT).toValue( (fn, millis) => {
         ListWrapper.push(commandLog, ['setTimeout', millis]);
         fn();
       }),
-      bind(WebDriverExtension).toValue(new MockDriverExtension(perfLogs, commandLog)),
+      bind(WebDriverExtension).toValue(new MockDriverExtension(perfLogs, commandLog, perfLogFeatures)),
       bind(Options.MICRO_ITERATIONS).toValue(microIterations)
     ];
     return new Injector(bindings).get(PerflogMetric);
@@ -39,8 +47,29 @@ export function main() {
 
   describe('perflog metric', () => {
 
-    it('should describe itself', () => {
-      expect(createMetric([[]]).describe()['script']).toBe('script execution time in ms');
+    it('should describe itself based on the perfLogFeatrues', () => {
+      expect(createMetric([[]], 0, new PerfLogFeatures()).describe()).toEqual({
+        'scriptTime': 'script execution time in ms, including gc and render',
+        'pureScriptTime': 'script execution time in ms, without gc nor render'
+      });
+
+      expect(createMetric([[]], 0, new PerfLogFeatures({
+        render: true,
+        gc: false
+      })).describe()).toEqual({
+        'scriptTime': 'script execution time in ms, including gc and render',
+        'pureScriptTime': 'script execution time in ms, without gc nor render',
+        'renderTime': 'render time in and ouside of script in ms',
+      });
+
+      expect(createMetric([[]]).describe()).toEqual({
+        'scriptTime': 'script execution time in ms, including gc and render',
+        'pureScriptTime': 'script execution time in ms, without gc nor render',
+        'renderTime': 'render time in and ouside of script in ms',
+        'gcTime': 'gc time in and ouside of script in ms',
+        'gcAmount': 'gc amount in kbytes',
+        'majorGcTime': 'time of major gcs in ms'
+      });
     });
 
     describe('beginMeasure', () => {
@@ -76,7 +105,7 @@ export function main() {
               ['timeEnd', 'benchpress0', null],
               'readPerfLog'
             ]);
-            expect(data['script']).toBe(2);
+            expect(data['scriptTime']).toBe(2);
 
             async.done();
         });
@@ -128,7 +157,7 @@ export function main() {
               [ 'setTimeout', 100 ],
               'readPerfLog'
             ]);
-            expect(data['script']).toBe(3);
+            expect(data['scriptTime']).toBe(3);
 
             async.done();
         });
@@ -144,7 +173,7 @@ export function main() {
         metric.beginMeasure()
           .then( (_) => metric.endMeasure(true) )
           .then( (data) => {
-            expect(data['script']).toBe(0);
+            expect(data['scriptTime']).toBe(0);
             return metric.endMeasure(true)
           })
           .then( (data) => {
@@ -155,7 +184,7 @@ export function main() {
               ['timeEnd', 'benchpress1', 'benchpress2'],
               'readPerfLog'
             ]);
-            expect(data['script']).toBe(3);
+            expect(data['scriptTime']).toBe(3);
 
             async.done();
         });
@@ -179,7 +208,7 @@ export function main() {
           eventFactory.start('script', 0),
           eventFactory.end('script', 5)
         ]).then((data) => {
-          expect(data['script']).toBe(5);
+          expect(data['scriptTime']).toBe(5);
           async.done();
         });
       }));
@@ -191,7 +220,7 @@ export function main() {
           eventFactory.start('script', 10),
           eventFactory.end('script', 17)
         ]).then((data) => {
-          expect(data['script']).toBe(12);
+          expect(data['scriptTime']).toBe(12);
           async.done();
         });
       }));
@@ -200,7 +229,7 @@ export function main() {
         aggregate([
           eventFactory.end('script', 10)
         ]).then((data) => {
-          expect(data['script']).toBe(0);
+          expect(data['scriptTime']).toBe(0);
           async.done();
         });
       }));
@@ -209,7 +238,7 @@ export function main() {
         aggregate([
           eventFactory.start('script', 10)
         ]).then((data) => {
-          expect(data['script']).toBe(0);
+          expect(data['scriptTime']).toBe(0);
           async.done();
         });
       }));
@@ -227,22 +256,30 @@ export function main() {
         metric.beginMeasure()
           .then( (_) => metric.endMeasure(false) )
           .then((data) => {
-            expect(data['script']).toBe(5);
+            expect(data['scriptTime']).toBe(5);
             async.done();
           });
       }));
 
-      ['script', 'render'].forEach( (metricName) => {
-        it(`should support ${metricName} metric`, inject([AsyncTestCompleter], (async) => {
-          aggregate([
-            eventFactory.start(metricName, 0),
-            eventFactory.end(metricName, 5)
-          ]).then((data) => {
-            expect(data[metricName]).toBe(5);
-            async.done();
-          });
-        }));
-      });
+      it('should support scriptTime metric', inject([AsyncTestCompleter], (async) => {
+        aggregate([
+          eventFactory.start('script', 0),
+          eventFactory.end('script', 5)
+        ]).then((data) => {
+          expect(data['scriptTime']).toBe(5);
+          async.done();
+        });
+      }));
+
+      it('should support renderTime metric', inject([AsyncTestCompleter], (async) => {
+        aggregate([
+          eventFactory.start('render', 0),
+          eventFactory.end('render', 5)
+        ]).then((data) => {
+          expect(data['renderTime']).toBe(5);
+          async.done();
+        });
+      }));
 
       it('should support gcTime/gcAmount metric', inject([AsyncTestCompleter], (async) => {
         aggregate([
@@ -252,55 +289,55 @@ export function main() {
           expect(data['gcTime']).toBe(5);
           expect(data['gcAmount']).toBe(1.5);
           expect(data['majorGcTime']).toBe(0);
-          expect(data['majorGcAmount']).toBe(0);
           async.done();
         });
       }));
 
-      it('should support majorGcTime/majorGcAmount metric', inject([AsyncTestCompleter], (async) => {
+      it('should support majorGcTime metric', inject([AsyncTestCompleter], (async) => {
         aggregate([
           eventFactory.start('gc', 0, {'usedHeapSize': 2500}),
           eventFactory.end('gc', 5, {'usedHeapSize': 1000, 'majorGc': true})
         ]).then((data) => {
           expect(data['gcTime']).toBe(5);
-          expect(data['gcAmount']).toBe(1.5);
           expect(data['majorGcTime']).toBe(5);
-          expect(data['majorGcAmount']).toBe(1.5);
           async.done();
         });
       }));
 
-      it('should subtract gcTime in script from script time', inject([AsyncTestCompleter], (async) => {
+      it('should support pureScriptTime = scriptTime-gcTime-renderTime', inject([AsyncTestCompleter], (async) => {
         aggregate([
           eventFactory.start('script', 0),
           eventFactory.start('gc', 1, {'usedHeapSize': 1000}),
           eventFactory.end('gc', 4, {'usedHeapSize': 0}),
-          eventFactory.end('script', 5)
+          eventFactory.start('render', 4),
+          eventFactory.end('render', 5),
+          eventFactory.end('script', 6)
         ]).then((data) => {
-          expect(data['script']).toBe(2);
+          expect(data['scriptTime']).toBe(6);
+          expect(data['pureScriptTime']).toBe(2);
           async.done();
         });
       }));
 
       describe('microIterations', () => {
 
-        it('should not report scriptMicroAvg if microIterations = 0', inject([AsyncTestCompleter], (async) => {
+        it('should not report microScriptTimeAvg if microIterations = 0', inject([AsyncTestCompleter], (async) => {
           aggregate([
             eventFactory.start('script', 0),
             eventFactory.end('script', 5)
           ], 0).then((data) => {
-            expect(isPresent(data['scriptMicroAvg'])).toBe(false);
+            expect(isPresent(data['microScriptTimeAvg'])).toBe(false);
             async.done();
           });
         }));
 
-        it('should report scriptMicroAvg', inject([AsyncTestCompleter], (async) => {
+        it('should report microScriptTimeAvg', inject([AsyncTestCompleter], (async) => {
           aggregate([
             eventFactory.start('script', 0),
             eventFactory.end('script', 5)
           ], 4).then((data) => {
-            expect(data['script']).toBe(5);
-            expect(data['scriptMicroAvg']).toBe(5/4);
+            expect(data['scriptTime']).toBe(5);
+            expect(data['microScriptTimeAvg']).toBe(5/4);
             async.done();
           });
         }));
@@ -315,10 +352,12 @@ export function main() {
 class MockDriverExtension extends WebDriverExtension {
   _perfLogs:List;
   _commandLog:List;
-  constructor(perfLogs, commandLog) {
+  _perfLogFeatures:PerfLogFeatures;
+  constructor(perfLogs, commandLog, perfLogFeatures) {
     super();
     this._perfLogs = perfLogs;
     this._commandLog = commandLog;
+    this._perfLogFeatures = perfLogFeatures;
   }
 
   timeBegin(name):Promise {
@@ -331,6 +370,10 @@ class MockDriverExtension extends WebDriverExtension {
     return PromiseWrapper.resolve(null);
   }
 
+  perfLogFeatures():PerfLogFeatures {
+    return this._perfLogFeatures;
+  }
+
   readPerfLog():Promise {
     ListWrapper.push(this._commandLog, 'readPerfLog');
     if (this._perfLogs.length > 0) {
diff --git a/modules/benchpress/test/reporter/json_file_reporter_spec.js b/modules/benchpress/test/reporter/json_file_reporter_spec.js
index 8f51c2670d..16f4a44e01 100644
--- a/modules/benchpress/test/reporter/json_file_reporter_spec.js
+++ b/modules/benchpress/test/reporter/json_file_reporter_spec.js
@@ -17,7 +17,8 @@ import { PromiseWrapper } from 'angular2/src/facade/async';
 import {
   bind, Injector,
   SampleDescription,
-  MeasureValues
+  MeasureValues,
+  Options
 } from 'benchpress/common';
 
 
@@ -32,7 +33,8 @@ export function main() {
         JsonFileReporter.BINDINGS,
         bind(SampleDescription).toValue(new SampleDescription(sampleId, descriptions, metrics)),
         bind(JsonFileReporter.PATH).toValue(path),
-        bind(JsonFileReporter.WRITE_FILE).toValue((filename, content) => {
+        bind(Options.NOW).toValue( () => DateWrapper.fromMillis(1234) ),
+        bind(Options.WRITE_FILE).toValue((filename, content) => {
           loggedFile = {
             'filename': filename,
             'content': content
diff --git a/modules/benchpress/test/sampler_spec.js b/modules/benchpress/test/sampler_spec.js
index 64e110bde0..d6da57f7f9 100644
--- a/modules/benchpress/test/sampler_spec.js
+++ b/modules/benchpress/test/sampler_spec.js
@@ -50,15 +50,17 @@ export function main() {
       if (isBlank(driverExtension)) {
         driverExtension = new MockDriverExtension([]);
       }
-      var bindings = ListWrapper.concat(Sampler.BINDINGS, [
+      var bindings = [
+        Options.DEFAULT_BINDINGS,
+        Sampler.BINDINGS,
         bind(Metric).toValue(metric),
         bind(Reporter).toValue(reporter),
         bind(WebDriverAdapter).toValue(driver),
         bind(WebDriverExtension).toValue(driverExtension),
         bind(Options.EXECUTE).toValue(execute),
         bind(Validator).toValue(validator),
-        bind(Sampler.TIME).toValue( () => DateWrapper.fromMillis(time++) )
-      ]);
+        bind(Options.NOW).toValue( () => DateWrapper.fromMillis(time++) )
+      ];
       if (isPresent(prepare)) {
         ListWrapper.push(bindings, bind(Options.PREPARE).toValue(prepare));
       }
diff --git a/modules/benchpress/test/webdriver/ios_driver_extension_spec.js b/modules/benchpress/test/webdriver/ios_driver_extension_spec.js
index 4e93eeaed3..0d43707a0e 100644
--- a/modules/benchpress/test/webdriver/ios_driver_extension_spec.js
+++ b/modules/benchpress/test/webdriver/ios_driver_extension_spec.js
@@ -41,12 +41,9 @@ export function main() {
       return extension;
     }
 
-    it('should force gc via window.gc()', inject([AsyncTestCompleter], (async) => {
-      createExtension().gc().then( (_) => {
-        expect(log).toEqual([['executeScript', 'window.gc()']]);
-        async.done();
-      });
-    }));
+    it('should throw on forcing gc', () => {
+      expect( () => createExtension().gc() ).toThrowError('Force GC is not supported on iOS');
+    });
 
     it('should mark the timeline via console.time()', inject([AsyncTestCompleter], (async) => {
       createExtension().timeBegin('someName').then( (_) => {
@@ -124,18 +121,6 @@ export function main() {
         });
       }));
 
-      it('should report gc', inject([AsyncTestCompleter], (async) => {
-        createExtension([
-          gcRecord(1, 3, 21)
-        ]).readPerfLog().then( (events) => {
-          expect(events).toEqual([
-            normEvents.start('gc', 1, {'usedHeapSize': 0}),
-            normEvents.end('gc', 3, {'usedHeapSize': -21}),
-          ]);
-          async.done();
-        });
-      }));
-
       ['RecalculateStyles', 'Layout', 'UpdateLayerTree', 'Paint', 'Rasterize', 'CompositeLayers'].forEach( (recordType) => {
         it(`should report ${recordType}`, inject([AsyncTestCompleter], (async) => {
           createExtension([
@@ -224,17 +209,6 @@ function internalScriptRecord(startTime, endTime) {
   };
 }
 
-function gcRecord(startTime, endTime, gcAmount) {
-  return {
-    'type': 'GCEvent',
-    'startTime': startTime,
-    'endTime': endTime,
-    'data': {
-      'usedHeapSizeDelta': gcAmount
-    }
-  };
-}
-
 class MockDriverAdapter extends WebDriverAdapter {
   _log:List;
   _perfRecords:List;