diff --git a/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/Main.java b/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/Main.java
index 86b9ff1b..b5bd69a8 100644
--- a/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/Main.java
+++ b/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/Main.java
@@ -11,8 +11,9 @@ public class Main {
     /////////////// BEGIN ARBITRARY HARDCODED VALUES ///////////////
 
     // 256MiB is Java Transfer Mgr v2 default.
-    // TODO: Investigate. At time of writing, this noticeably impacts performance.
-    public static final int BACKPRESSURE_INITIAL_READ_WINDOW_MiB = 256;
+    // This benchmark can turn off backpressure and rely solely on the
+    // memory-limiter.
+    public static final int BACKPRESSURE_INITIAL_READ_WINDOW_MiB = 0;
 
     /////////////// END ARBITRARY HARD-CODED VALUES ///////////////
 
diff --git a/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/crtjava/CRTJavaBenchmarkRunner.java b/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/crtjava/CRTJavaBenchmarkRunner.java
index bcaf6a50..a84f0c64 100644
--- a/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/crtjava/CRTJavaBenchmarkRunner.java
+++ b/runners/s3-benchrunner-java/src/main/java/com/example/s3benchrunner/crtjava/CRTJavaBenchmarkRunner.java
@@ -78,7 +78,7 @@ public CRTJavaBenchmarkRunner(BenchmarkConfig config, String bucket, String regi
         // If writing data to disk, enable backpressure.
         // This prevents us from running out of memory due to downloading
         // data faster than we can write it to disk.
-        if (config.filesOnDisk) {
+        if (config.filesOnDisk && Main.BACKPRESSURE_INITIAL_READ_WINDOW_MiB!=0) {
             s3ClientOpts.withReadBackpressureEnabled(true);
             s3ClientOpts.withInitialReadWindowSize(Util.bytesFromMiB(Main.BACKPRESSURE_INITIAL_READ_WINDOW_MiB));
         }