diff --git a/netty/src/main/java/io/grpc/netty/NettyClientHandler.java b/netty/src/main/java/io/grpc/netty/NettyClientHandler.java
index 1ac14585159..0c43ed5d527 100644
--- a/netty/src/main/java/io/grpc/netty/NettyClientHandler.java
+++ b/netty/src/main/java/io/grpc/netty/NettyClientHandler.java
@@ -224,6 +224,12 @@ static NettyClientHandler newHandler(
 
     Http2Settings settings = new Http2Settings();
     settings.pushEnabled(false);
+    // Netty default, gRPC default: 0x4000 = 16,384 B = 16 KiB
+    // GRPC_CLIENT_MAX_FRAME_SIZE override default: 64 KiB
+    // Absolute maximum (inclusive): 0xFFFFFF = 16,777,215 B = (16 MiB - 1 B)
+    // (defined in https://www.rfc-editor.org/rfc/rfc9113.html#SETTINGS_MAX_FRAME_SIZE)
+    settings.maxFrameSize(
+        Integer.parseInt(System.getenv().getOrDefault("GRPC_CLIENT_MAX_FRAME_SIZE", "64")) * 1024);
     settings.initialWindowSize(flowControlWindow);
     settings.maxConcurrentStreams(0);
     settings.maxHeaderListSize(maxHeaderListSize);
diff --git a/netty/src/main/java/io/grpc/netty/NettyServerHandler.java b/netty/src/main/java/io/grpc/netty/NettyServerHandler.java
index 6382471f46a..a5b83276927 100644
--- a/netty/src/main/java/io/grpc/netty/NettyServerHandler.java
+++ b/netty/src/main/java/io/grpc/netty/NettyServerHandler.java
@@ -226,7 +226,18 @@ static NettyServerHandler newHandler(
 
     final Http2Connection connection = new DefaultHttp2Connection(true);
     WeightedFairQueueByteDistributor dist = new WeightedFairQueueByteDistributor(connection);
-    dist.allocationQuantum(16 * 1024); // Make benchmarks fast again.
+    // Amount of bytes that will be allocated to each stream.
+    // Netty default: 1 KiB
+    // gRPC default: 16 KiB
+    // gRPC default override: 64 KiB
+    // Env var default: GRPC_CLIENT_MAX_FRAME_SIZE or 64 KiB
+    int aq = 64;
+    if (System.getenv("GRPC_SERVER_STREAM_ALLOCATION_QUANTUM") != null) {
+      aq = Integer.parseInt(System.getenv("GRPC_SERVER_STREAM_ALLOCATION_QUANTUM"));
+    } else if (System.getenv("GRPC_CLIENT_MAX_FRAME_SIZE") != null) {
+      aq = Integer.parseInt(System.getenv("GRPC_CLIENT_MAX_FRAME_SIZE"));
+    }
+    dist.allocationQuantum(aq * 1024); // Make benchmarks fast again.
     DefaultHttp2RemoteFlowController controller =
         new DefaultHttp2RemoteFlowController(connection, dist);
     connection.remote().flowController(controller);