diff --git a/kvstore/shipping_test.go b/kvstore/shipping_test.go
index ba5097c..d488b79 100644
--- a/kvstore/shipping_test.go
+++ b/kvstore/shipping_test.go
@@ -125,8 +125,8 @@ func TestShipping(t *testing.T) {
 	})
 
 	run("simple concurrent", func(t *testing.T, pDir, sDir string, prim, sec *KV, cbs *callbacks, nw *testconn.Network) {
-		M := 1000
-		N := 100
+		M := 64
+		N := 128
 
 		wg := sync.WaitGroup{}
 
diff --git a/kvstore/sync-send.go b/kvstore/sync-send.go
index 0737c42..10f11b6 100644
--- a/kvstore/sync-send.go
+++ b/kvstore/sync-send.go
@@ -28,7 +28,7 @@ func (kv *KV) SyncSend(conn net.Conn) {
 
 POLL:
 
-	for i := 0; i < 8; i++ {
+	for i := 0; i < 4; i++ {
 		if kv.MaxSeqNum() > afterSeqNum {
 			goto REPLAY
 		}