diff --git a/install.sh b/install.sh
index 840c008..ed2234d 100755
--- a/install.sh
+++ b/install.sh
@@ -2,7 +2,7 @@
 set -xe
 
 sudo apt update
-sudo apt install -y curl wireguard python3 tmux
+sudo apt install -y curl wireguard python3 tmux build-essential
 
 mkdir -p local
 mkdir -p local/tunnel
@@ -10,6 +10,8 @@ mkdir -p local/tunnel
 mkdir -p bin
 cd bin
 
+gcc -O3 -o w2u ../w2u.c
+
 curl -vL https://github.com/wangyu-/udp2raw-tunnel/releases/download/20200818.0/udp2raw_binaries.tar.gz -o udp2raw.tgz
 tar -xvzf udp2raw.tgz udp2raw_amd64
 chmod +x udp2raw_amd64
diff --git a/install_cn.sh b/install_cn.sh
index c0be488..191dd10 100755
--- a/install_cn.sh
+++ b/install_cn.sh
@@ -2,7 +2,7 @@
 set -xe
 
 sudo apt update
-sudo apt install -y curl wireguard python3 tmux
+sudo apt install -y curl wireguard python3 tmux build-essential
 
 mkdir -p local
 mkdir -p local/tunnel
@@ -10,6 +10,8 @@ mkdir -p local/tunnel
 mkdir -p bin
 cd bin
 
+gcc -O3 -o w2u ../w2u.c
+
 rm -rf wg-op-binary
 git clone https://gitee.com/kiritow/wg-op-binary
 cd wg-op-binary
diff --git a/tool_create.py b/tool_create.py
index 753846f..fb9338a 100644
--- a/tool_create.py
+++ b/tool_create.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 import os
 import getpass
-from tool_common import load_config, save_config, SimpleLogger, json_to_base64
+from tool_common import load_config, save_config, json_to_base64
 
 
 config = load_config()
diff --git a/tool_generate.py b/tool_generate.py
index a941e5d..309ffb8 100644
--- a/tool_generate.py
+++ b/tool_generate.py
@@ -16,6 +16,7 @@ def write_tunnel_config(mode, listen_addr, remote_addr, password):
 -r {}
 -k {}
 --raw-mode faketcp
+--fix-gro
 -a
 '''.format(mode, listen_addr, remote_addr, password))
     return filename
diff --git a/w2u.c b/w2u.c
index af4d5c4..4ef9863 100644
--- a/w2u.c
+++ b/w2u.c
@@ -9,7 +9,7 @@
 #include <unistd.h>
 #include <errno.h>
 
-// WireGuard ---> W2U --> Internet
+// WireGuard ---> W2U --> udp2raw
 int main(int argc, char* argv[])
 {
     int ret, flags;