diff --git a/interface.go b/interface.go
index 082906d..af63745 100644
--- a/interface.go
+++ b/interface.go
@@ -271,7 +271,7 @@ func (f *Interface) listenOut(i int) {
 	fwPacket := &firewall.Packet{}
 	nb := make([]byte, 12, 12)
 
-	li.ListenOut(func(fromUdpAddr netip.AddrPort, payload []byte) {
+	li.ListenOut(func(fromUdpAddr netip.AddrPort, payload []byte, q int) {
 		f.readOutsidePackets(fromUdpAddr, nil, plaintext[:0], payload, h, fwPacket, lhh, nb, i, ctCache.Get(f.l))
 	})
 }
diff --git a/udp/conn.go b/udp/conn.go
index 895b0df..d00f276 100644
--- a/udp/conn.go
+++ b/udp/conn.go
@@ -11,6 +11,7 @@ const MTU = 9001
 type EncReader func(
 	addr netip.AddrPort,
 	payload []byte,
+	q int,
 )
 
 type Conn interface {
diff --git a/udp/udp_linux.go b/udp/udp_linux.go
index 4ab466f..3ca2e88 100644
--- a/udp/udp_linux.go
+++ b/udp/udp_linux.go
@@ -25,7 +25,7 @@ const (
 	defaultGSOMaxSegments    = 64
 	defaultGSOMaxBytes       = 64000
 	defaultGROReadBufferSize = 2 * defaultGSOMaxBytes
-	defaultGSOFlushTimeout   = 50 * time.Microsecond
+	defaultGSOFlushTimeout   = 100 * time.Microsecond
 )
 
 type StdConn struct {
@@ -171,19 +171,17 @@ func (u *StdConn) ListenOut(r EncReader) {
 
 	for {
 		//desiredControl := int(u.controlLen.Load())
-		hasControl := len(controls) > 0
+		//hasControl := len(controls) > 0
 		//if (desiredControl > 0) != hasControl || (desiredControl > 0 && hasControl && len(controls[0]) != desiredControl) {
 		//	msgs, buffers, names, controls = u.PrepareRawMessages(u.batch)
 		//	hasControl = len(controls) > 0
 		//}
 		//
-		if hasControl {
-			for i := range msgs {
-				if len(controls) <= i || len(controls[i]) == 0 {
-					continue
-				}
-				msgs[i].Hdr.Controllen = controllen(len(controls[i]))
+		for i := range msgs {
+			if len(controls) <= i || len(controls[i]) == 0 {
+				continue
 			}
+			msgs[i].Hdr.Controllen = controllen(len(controls[i]))
 		}
 
 		n, err := read(msgs)
@@ -224,7 +222,7 @@ func (u *StdConn) ListenOut(r EncReader) {
 				}
 			}
 
-			r(addr, buffers[i][:payloadLen])
+			r(addr, buffers[i][:payloadLen], 0)
 		}
 	}
 }
@@ -386,6 +384,7 @@ func (u *StdConn) writeToGSO(b []byte, addr netip.AddrPort) error {
 		}
 	}
 
+	inBuf := len(u.gsoPendingBuf) + len(b)
 	if len(u.gsoPendingBuf)+len(b) > u.gsoMaxBytes {
 		if err := u.flushPendingLocked(); err != nil {
 			return err
@@ -405,7 +404,7 @@ func (u *StdConn) writeToGSO(b []byte, addr netip.AddrPort) error {
 		return u.flushPendingLocked()
 	}
 
-	u.scheduleFlushLocked()
+	u.scheduleFlushLocked(inBuf)
 	return nil
 }
 
@@ -531,19 +530,25 @@ func (u *StdConn) sendSequentialLocked(buf []byte, addr netip.AddrPort, segSize
 	return nil
 }
 
-func (u *StdConn) scheduleFlushLocked() {
+func (u *StdConn) scheduleFlushLocked(inBuf int) {
 	if u.gsoFlushTimeout <= 0 {
 		_ = u.flushPendingLocked()
 		return
 	}
+
+	t := u.gsoFlushTimeout
+	if inBuf > u.gsoMaxBytes/2 {
+		t = t / 2
+	}
+
 	if u.gsoFlushTimer == nil {
-		u.gsoFlushTimer = time.AfterFunc(u.gsoFlushTimeout, u.flushTimerHandler)
+		u.gsoFlushTimer = time.AfterFunc(t, u.flushTimerHandler)
 		return
 	}
 	if !u.gsoFlushTimer.Stop() {
 		// timer already fired or running; allow handler to exit if no data
 	}
-	u.gsoFlushTimer.Reset(u.gsoFlushTimeout)
+	u.gsoFlushTimer.Reset(t)
 }
 
 func (u *StdConn) stopFlushTimerLocked() {
@@ -621,7 +626,8 @@ func (u *StdConn) emitSegments(r EncReader, addr netip.AddrPort, payload []byte,
 		}
 
 		//segment := append([]byte(nil), payload[start:end]...)
-		r(addr, payload[start:end])
+		//q := numSegments % 4 //TODO
+		r(addr, payload[start:end], 0)
 		numSegments++
 		//segments = append(segments, segment)
 		start = end
@@ -714,12 +720,14 @@ func (u *StdConn) parseGROSegment(msg *rawMessage, control []byte) (int, int) {
 			if len(c.Data) >= 4 {
 				segCount = int(binary.NativeEndian.Uint16(c.Data[2:4]))
 			}
-			u.l.WithFields(logrus.Fields{
-				"tag":       "gro-debug",
-				"stage":     "parse",
-				"seg_size":  segSize,
-				"seg_count": segCount,
-			}).Debug("gro-debug control parsed")
+			if u.l.Level >= logrus.DebugLevel {
+				u.l.WithFields(logrus.Fields{
+					"tag":       "gro-debug",
+					"stage":     "parse",
+					"seg_size":  segSize,
+					"seg_count": segCount,
+				}).Debug("gro-debug control parsed")
+			}
 			return segSize, segCount
 		}
 	}