diff --git a/jetty-websocket/websocket-server/src/test/java/org/eclipse/jetty/websocket/server/ab/TestABCase6.java b/jetty-websocket/websocket-server/src/test/java/org/eclipse/jetty/websocket/server/ab/TestABCase6.java
index f8eef39cc37..1dd84d3ca28 100644
--- a/jetty-websocket/websocket-server/src/test/java/org/eclipse/jetty/websocket/server/ab/TestABCase6.java
+++ b/jetty-websocket/websocket-server/src/test/java/org/eclipse/jetty/websocket/server/ab/TestABCase6.java
@@ -21,7 +21,6 @@ package org.eclipse.jetty.websocket.server.ab;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.TimeUnit;
 
 import org.eclipse.jetty.util.BufferUtil;
 import org.eclipse.jetty.util.StringUtil;
@@ -278,20 +277,24 @@ public class TestABCase6 extends AbstractABCase
         byte part2[] = Hex.asByteArray("F4908080"); // invalid
         byte part3[] = StringUtil.getUtf8Bytes("edited");
 
+        ByteBuffer b1 = ByteBuffer.wrap(part1);
+        ByteBuffer b2 = ByteBuffer.wrap(part2);
+        ByteBuffer b3 = ByteBuffer.wrap(part3);
+
+        List<WebSocketFrame> send = new ArrayList<>();
+        send.add(new TextFrame().setPayload(b1).setFin(false));
+        send.add(new ContinuationFrame().setPayload(b2).setFin(true));
+        send.add(new ContinuationFrame().setPayload(b3).setFin(true));
+        send.add(new CloseInfo(StatusCode.NORMAL).asFrame());
+
         List<WebSocketFrame> expect = new ArrayList<>();
         expect.add(new CloseInfo(StatusCode.BAD_PAYLOAD).asFrame());
 
         try (Fuzzer fuzzer = new Fuzzer(this))
         {
             fuzzer.connect();
-            fuzzer.setSendMode(Fuzzer.SendMode.BULK);
-
-            fuzzer.send(new TextFrame().setPayload(ByteBuffer.wrap(part1)).setFin(false));
-            TimeUnit.SECONDS.sleep(1);
-            fuzzer.send(new ContinuationFrame().setPayload(ByteBuffer.wrap(part2)).setFin(false));
-            TimeUnit.SECONDS.sleep(1);
-            fuzzer.send(new ContinuationFrame().setPayload(ByteBuffer.wrap(part3)).setFin(true));
-
+            fuzzer.setSendMode(Fuzzer.SendMode.PER_FRAME);
+            fuzzer.send(send);
             fuzzer.expect(expect);
         }
     }
@@ -313,18 +316,24 @@ public class TestABCase6 extends AbstractABCase
         byte part2[] = Hex.asByteArray("90"); // continue code point & invalid
         byte part3[] = Hex.asByteArray("8080656469746564"); // continue code point & finish
 
+        ByteBuffer b1 = ByteBuffer.wrap(part1);
+        ByteBuffer b2 = ByteBuffer.wrap(part2);
+        ByteBuffer b3 = ByteBuffer.wrap(part3);
+
+        List<WebSocketFrame> send = new ArrayList<>();
+        send.add(new TextFrame().setPayload(b1).setFin(false));
+        send.add(new ContinuationFrame().setPayload(b2).setFin(true));
+        send.add(new ContinuationFrame().setPayload(b3).setFin(true));
+        send.add(new CloseInfo(StatusCode.NORMAL).asFrame());
+
         List<WebSocketFrame> expect = new ArrayList<>();
         expect.add(new CloseInfo(StatusCode.BAD_PAYLOAD).asFrame());
 
         try (Fuzzer fuzzer = new Fuzzer(this))
         {
             fuzzer.connect();
-            fuzzer.setSendMode(Fuzzer.SendMode.BULK);
-            fuzzer.send(new TextFrame().setPayload(ByteBuffer.wrap(part1)).setFin(false));
-            TimeUnit.SECONDS.sleep(1);
-            fuzzer.send(new ContinuationFrame().setPayload(ByteBuffer.wrap(part2)).setFin(false));
-            TimeUnit.SECONDS.sleep(1);
-            fuzzer.send(new ContinuationFrame().setPayload(ByteBuffer.wrap(part3)).setFin(true));
+            fuzzer.setSendMode(Fuzzer.SendMode.PER_FRAME);
+            fuzzer.send(send);
             fuzzer.expect(expect);
         }
     }
@@ -371,9 +380,7 @@ public class TestABCase6 extends AbstractABCase
                 part3.limit(splits[2]);
 
                 fuzzer.send(part1); // the header + good utf
-                TimeUnit.MILLISECONDS.sleep(500);
                 fuzzer.send(part2); // the bad UTF
-                TimeUnit.MILLISECONDS.sleep(500);
                 fuzzer.send(part3); // the rest (shouldn't work)
 
                 fuzzer.expect(expect);
@@ -404,9 +411,7 @@ public class TestABCase6 extends AbstractABCase
             ByteBuffer net = fuzzer.asNetworkBuffer(send);
             fuzzer.send(net,6);
             fuzzer.send(net,11);
-            TimeUnit.SECONDS.sleep(1);
             fuzzer.send(net,1);
-            TimeUnit.SECONDS.sleep(1);
             fuzzer.send(net,100); // the rest
 
             fuzzer.expect(expect);