diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
index 8e03f5acd..33fbd0dc2 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
@@ -109,6 +109,7 @@ import org.hl7.fhir.r5.terminologies.ValueSetExpander.ValueSetExpansionOutcome;
 import org.hl7.fhir.r5.terminologies.ValueSetExpanderSimple;
 import org.hl7.fhir.r5.utils.ToolingExtensions;
 import org.hl7.fhir.utilities.OIDUtils;
+import org.hl7.fhir.utilities.TimeTracker;
 import org.hl7.fhir.utilities.ToolingClientLogger;
 import org.hl7.fhir.utilities.TranslationServices;
 import org.hl7.fhir.utilities.Utilities;
@@ -200,17 +201,19 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
   protected Parameters expParameters;
   private TranslationServices translator = new NullTranslator();
   protected TerminologyCache txCache;
-
+  protected TimeTracker clock;
   private boolean tlogging = true;
   
   public BaseWorkerContext() throws FileNotFoundException, IOException, FHIRException {
     txCache = new TerminologyCache(lock, null);
     setValidationMessageLanguage(getLocale());
+    clock = new TimeTracker();
   }
 
   public BaseWorkerContext(Locale locale) throws FileNotFoundException, IOException, FHIRException {
     txCache = new TerminologyCache(lock, null);
     setValidationMessageLanguage(locale);
+    clock = new TimeTracker();
   }
 
   public BaseWorkerContext(CanonicalResourceManager<CodeSystem> codeSystems, CanonicalResourceManager<ValueSet> valueSets, CanonicalResourceManager<ConceptMap> maps, CanonicalResourceManager<StructureDefinition> profiles,
@@ -221,6 +224,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     this.maps = maps;
     this.structures = profiles;
     this.guides = guides;
+    clock = new TimeTracker();
   }
 
   protected void copy(BaseWorkerContext other) {
@@ -1914,5 +1918,15 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     }
   }
 
-  
+  public TimeTracker clock() {
+    return clock;
+  }
+ 
+
+  public int countAllCaches() {
+    return codeSystems.size() + valueSets.size() + maps.size() + transforms.size() + structures.size() + measures.size() + libraries.size() + 
+        guides.size() + capstmts.size() + searchParameters.size() + questionnaires.size() + operations.size() + plans.size() + systems.size();
+  }
+
+
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
index 0d31f3d3f..8a0593606 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
@@ -65,6 +65,7 @@ import org.hl7.fhir.r5.model.ValueSet.ConceptSetComponent;
 import org.hl7.fhir.r5.terminologies.ValueSetExpander.TerminologyServiceErrorClass;
 import org.hl7.fhir.r5.terminologies.ValueSetExpander.ValueSetExpansionOutcome;
 import org.hl7.fhir.r5.utils.IResourceValidator;
+import org.hl7.fhir.utilities.TimeTracker;
 import org.hl7.fhir.utilities.TranslationServices;
 import org.hl7.fhir.utilities.cache.BasePackageCacheManager;
 import org.hl7.fhir.utilities.cache.NpmPackage;
@@ -769,4 +770,6 @@ public interface IWorkerContext {
 
   public int getClientRetryCount();
   public IWorkerContext setClientRetryCount(int value);
+  
+  public TimeTracker clock();
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
index d66cee01c..207d6ec29 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
@@ -78,6 +78,7 @@ import org.hl7.fhir.r5.terminologies.TerminologyClient;
 import org.hl7.fhir.r5.utils.IResourceValidator;
 import org.hl7.fhir.utilities.CSFileInputStream;
 import org.hl7.fhir.utilities.TextFile;
+import org.hl7.fhir.utilities.TimeTracker;
 import org.hl7.fhir.utilities.Utilities;
 import org.hl7.fhir.utilities.VersionUtilities;
 import org.hl7.fhir.utilities.cache.BasePackageCacheManager;
@@ -810,9 +811,8 @@ public class SimpleWorkerContext extends BaseWorkerContext implements IWorkerCon
     return loadedPackages.contains(id+"#"+ver);
   }
 
-
-
- 
-
-
+  public void setClock(TimeTracker tt) {
+    clock = tt;
+    
+  }
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/TimeTracker.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/TimeTracker.java
new file mode 100644
index 000000000..0ea7c03b6
--- /dev/null
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/TimeTracker.java
@@ -0,0 +1,101 @@
+package org.hl7.fhir.utilities;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.hl7.fhir.utilities.TimeTracker.Counter;
+
+public class TimeTracker {
+
+  public class Counter {
+    private String name;
+    private int count;
+    private long length;
+    public Counter(String name) {
+      this.name = name;
+    }
+  }
+  
+  public class Session {
+    private long start = System.nanoTime();
+    private String name;
+    public Session(String name) {
+      this.name = name;
+    }
+    public void end() {
+      endSession(this);
+    }
+  }
+  
+  private List<Session> sessions = new ArrayList<>();
+  private List<Counter> records = new ArrayList<>();
+  private long globalStart;
+  private long milestone = 0;
+  
+  
+  public TimeTracker() {
+    super();
+    globalStart = System.nanoTime();
+  }
+
+  public Session start(String name) {
+    Counter c = null;
+    for (Counter t : records) {
+      if (t.name.equals(name)) {
+        c = t;
+      }
+    }
+    if (c == null) {
+      c = new Counter(name);
+      records.add(c);
+    }
+    Session session = new Session(name);
+    sessions.add(session);
+    return session;
+  }
+
+  private void endSession(Session session) {
+    sessions.remove(session);
+    Counter c = null;
+    for (Counter t : records) {
+      if (t.name.equals(session.name)) {
+        c = t;
+      }
+    }
+    c.count++;
+    c.length = c.length + System.nanoTime() - session.start;
+  }
+
+  
+  public String report() {
+    CommaSeparatedStringBuilder b = new CommaSeparatedStringBuilder();
+    for (Counter c : records) {
+      if (c.count == 1) {
+        b.append(c.name+": "+Utilities.presentDuration(c.length));
+      }
+    }
+    for (Counter c : records) {
+      if (c.count > 1) {
+        b.append(c.name+": "+Utilities.presentDuration(c.length)+" (#"+c.count+")");
+      }
+    }
+    return "Times: "+b.toString();
+  }
+  
+  public String clock() {
+    return Utilities.presentDuration(System.nanoTime() - globalStart);
+  }
+
+  public String instant() {
+    return Utilities.presentDuration(System.nanoTime() - globalStart);
+  }
+
+  public String milestone() {
+    long start = milestone == 0 ? globalStart : milestone ;
+    milestone = System.nanoTime();
+    return Utilities.presentDuration(milestone - start);
+  }
+
+}