diff --git a/perf.go b/perf.go
index 9b36f51..e663826 100644
--- a/perf.go
+++ b/perf.go
@@ -9,7 +9,9 @@ const ALPN = "perf"
 
 var config = &quic.Config{
 	// use massive flow control windows here to make sure that flow control is not the limiting factor
-	MaxConnectionReceiveWindow: 1 << 30,
-	MaxStreamReceiveWindow:     1 << 30,
-	Tracer:                     qlog.DefaultConnectionTracer,
+	InitialStreamReceiveWindow:     1 << 20,
+	InitialConnectionReceiveWindow: 1 << 20,
+	MaxConnectionReceiveWindow:     1 << 30,
+	MaxStreamReceiveWindow:         1 << 30,
+	Tracer:                         qlog.DefaultConnectionTracer,
 }