diff --git a/hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/parser/JsonParserR4Test.java b/hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/parser/JsonParserR4Test.java
index 36698fd89bd..e885fbad4eb 100644
--- a/hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/parser/JsonParserR4Test.java
+++ b/hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/parser/JsonParserR4Test.java
@@ -2,9 +2,11 @@ package ca.uhn.fhir.parser;
 
 import ca.uhn.fhir.context.FhirContext;
 import ca.uhn.fhir.rest.api.Constants;
+import ca.uhn.fhir.util.StopWatch;
 import ca.uhn.fhir.util.TestUtil;
 import com.google.common.collect.Sets;
 import org.apache.commons.io.IOUtils;
+import org.apache.commons.io.output.NullWriter;
 import org.apache.commons.lang.StringUtils;
 import org.hl7.fhir.r4.model.*;
 import org.junit.AfterClass;
@@ -14,8 +16,10 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.util.Date;
 import java.util.HashSet;
 import java.util.Set;
+import java.util.concurrent.TimeUnit;
 
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.core.IsNot.not;
@@ -444,6 +448,134 @@ public class JsonParserR4Test {
 
 	}
 
+	/**
+	 * 2019-09-19
+	 * 18:24:48.548 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:483] - Encoded 200 passes - 50ms / pass - 19.7 / second
+	 * 18:24:52.472 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:483] - Encoded 300 passes - 47ms / pass - 21.3 / second
+	 * 18:24:56.428 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:483] - Encoded 400 passes - 45ms / pass - 22.2 / second
+	 * 18:25:00.463 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:483] - Encoded 500 passes - 44ms / pass - 22.6 / second
+	 *
+	 */
+	@Test
+	@Ignore
+	public void testTimingsOutput() throws IOException {
+
+		Bundle b = createBigBundle();
+
+		IParser parser = ourCtx.newJsonParser();
+		StopWatch sw = new StopWatch();
+		for (int i = 0; ; i++) {
+			parser.encodeResourceToWriter(b, new NullWriter());
+			if (i % 100 == 0) {
+				ourLog.info("Encoded {} passes - {} / pass - {} / second", i, sw.formatMillisPerOperation(i), sw.formatThroughput(i, TimeUnit.SECONDS));
+			}
+		}
+
+	}
+
+	/**
+	 * 2019-09-19
+	 * 18:33:08.720 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:495] - Encoded 200 passes - 47ms / pass - 21.2 / second
+	 * 18:33:12.453 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:495] - Encoded 300 passes - 43ms / pass - 22.7 / second
+	 * 18:33:16.195 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:495] - Encoded 400 passes - 42ms / pass - 23.6 / second
+	 * 18:33:19.912 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:495] - Encoded 500 passes - 41ms / pass - 24.2 / second
+	 */
+	@Test
+	@Ignore
+	public void testTimingsOutputXml() throws IOException {
+
+		Bundle b = createBigBundle();
+
+		IParser parser = ourCtx.newXmlParser();
+		StopWatch sw = new StopWatch();
+		for (int i = 0; ; i++) {
+			parser.encodeResourceToWriter(b, new NullWriter());
+			if (i % 100 == 0) {
+				ourLog.info("Encoded {} passes - {} / pass - {} / second", i, sw.formatMillisPerOperation(i), sw.formatThroughput(i, TimeUnit.SECONDS));
+			}
+		}
+
+	}
+
+	/**
+	 * 2019-09-19
+	 * 18:31:01.513 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:486] - Parsed 600 passes - 37ms / pass - 27.0 / second
+	 * 18:31:04.454 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:486] - Parsed 700 passes - 35ms / pass - 27.8 / second
+	 * 18:31:07.451 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:486] - Parsed 800 passes - 35ms / pass - 28.4 / second
+	 * 18:31:10.457 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:486] - Parsed 900 passes - 34ms / pass - 28.9 / second
+	 */
+	@Test
+	@Ignore
+	public void testTimingsInput() throws IOException {
+		Bundle b = createBigBundle();
+		IParser parser = ourCtx.newJsonParser();
+		String input = parser.encodeResourceToString(b);
+
+		StopWatch sw = new StopWatch();
+		for (int i = 0; ; i++) {
+			parser.parseResource(input);
+			if (i % 100 == 0) {
+				ourLog.info("Parsed {} passes - {} / pass - {} / second", i, sw.formatMillisPerOperation(i), sw.formatThroughput(i, TimeUnit.SECONDS));
+			}
+		}
+
+	}
+
+
+	/**
+	 * 2019-09-19
+	 * 18:32:04.518 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:513] - Parsed 200 passes - 37ms / pass - 26.8 / second
+	 * 18:32:07.829 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:513] - Parsed 300 passes - 35ms / pass - 27.8 / second
+	 * 18:32:11.087 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:513] - Parsed 400 passes - 35ms / pass - 28.5 / second
+	 * 18:32:14.357 [main] INFO  ca.uhn.fhir.parser.JsonParserR4Test [JsonParserR4Test.java:513] - Parsed 500 passes - 34ms / pass - 28.9 / second
+	 */
+	@Test
+	@Ignore
+	public void testTimingsInputXml() throws IOException {
+		Bundle b = createBigBundle();
+		IParser parser = ourCtx.newXmlParser();
+		String input = parser.encodeResourceToString(b);
+
+		StopWatch sw = new StopWatch();
+		for (int i = 0; ; i++) {
+			parser.parseResource(input);
+			if (i % 100 == 0) {
+				ourLog.info("Parsed {} passes - {} / pass - {} / second", i, sw.formatMillisPerOperation(i), sw.formatThroughput(i, TimeUnit.SECONDS));
+			}
+		}
+
+	}
+
+
+	private Bundle createBigBundle() {
+		Observation obs = new Observation();
+
+		Bundle b = new Bundle();
+
+		for (int i = 0; i < 100; i++) {
+
+			Patient pt = new Patient();
+			pt.addName().setFamily("FAM");
+			obs.getSubject().setResource(pt);
+
+			Encounter enc = new Encounter();
+			enc.setId("#1");
+			enc.setStatus(Encounter.EncounterStatus.ARRIVED);
+			obs.getEncounter().setReference("#1");
+			obs.getContained().add(enc);
+			obs.setEffective(new DateTimeType(new Date()));
+			obs.addIdentifier()
+				.setSystem("http://foo")
+				.setValue("blah");
+			obs.setValue(new Quantity().setSystem("UCUM").setCode("mg/L").setUnit("mg/L").setValue(123.567d));
+
+			b.addEntry().setResource(obs);
+
+		}
+		return b;
+	}
+
+
 	@AfterClass
 	public static void afterClassClearContext() {
 		TestUtil.clearAllStaticFieldsForUnitTest();