diff --git a/crates/shadowsocks-service/src/config.rs b/crates/shadowsocks-service/src/config.rs
index d71241efd172..199038a14950 100644
--- a/crates/shadowsocks-service/src/config.rs
+++ b/crates/shadowsocks-service/src/config.rs
@@ -1528,8 +1528,12 @@ impl Config {
                     };
                     #[cfg(target_os = "macos")]
                     {
-                        local_config.launchd_tcp_socket_name = config.launchd_tcp_socket_name.clone();
-                        local_config.launchd_udp_socket_name = config.launchd_udp_socket_name.clone();
+                        local_config
+                            .launchd_tcp_socket_name
+                            .clone_from(&config.launchd_tcp_socket_name);
+                        local_config
+                            .launchd_udp_socket_name
+                            .clone_from(&config.launchd_udp_socket_name);
                     }
 
                     let local_instance = LocalInstanceConfig {
@@ -2613,8 +2617,8 @@ impl fmt::Display for Config {
 
                 #[cfg(target_os = "macos")]
                 {
-                    jconf.launchd_tcp_socket_name = local.launchd_tcp_socket_name.clone();
-                    jconf.launchd_udp_socket_name = local.launchd_udp_socket_name.clone();
+                    jconf.launchd_tcp_socket_name.clone_from(&local.launchd_tcp_socket_name);
+                    jconf.launchd_udp_socket_name.clone_from(&local.launchd_udp_socket_name);
                 }
 
                 if local.protocol != ProtocolType::Socks {
@@ -2981,7 +2985,7 @@ impl fmt::Display for Config {
         }
 
         jconf.outbound_bind_addr = self.outbound_bind_addr.map(|i| i.to_string());
-        jconf.outbound_bind_interface = self.outbound_bind_interface.clone();
+        jconf.outbound_bind_interface.clone_from(&self.outbound_bind_interface);
 
         // Security
         if self.security.replay_attack.policy != ReplayAttackPolicy::default() {
diff --git a/crates/shadowsocks-service/src/local/http/utils.rs b/crates/shadowsocks-service/src/local/http/utils.rs
index 41bd4a6c8920..a79d57a15c50 100644
--- a/crates/shadowsocks-service/src/local/http/utils.rs
+++ b/crates/shadowsocks-service/src/local/http/utils.rs
@@ -131,12 +131,8 @@ pub async fn connect_host(
     } else {
         let server = balancer.best_tcp_server();
 
-        match AutoProxyClientStream::connect_with_opts(
-            context,
-            server.as_ref(),
-            host,
-            server.connect_opts_ref()
-        ).await {
+        match AutoProxyClientStream::connect_with_opts(context, server.as_ref(), host, server.connect_opts_ref()).await
+        {
             Ok(s) => Ok((s, Some(server))),
             Err(err) => {
                 error!(
diff --git a/crates/shadowsocks-service/src/local/net/tcp/auto_proxy_stream.rs b/crates/shadowsocks-service/src/local/net/tcp/auto_proxy_stream.rs
index ed19aa6ba538..36fea6b32e32 100644
--- a/crates/shadowsocks-service/src/local/net/tcp/auto_proxy_stream.rs
+++ b/crates/shadowsocks-service/src/local/net/tcp/auto_proxy_stream.rs
@@ -85,8 +85,7 @@ impl AutoProxyClientStream {
         if let Some(mapped_addr) = context.try_map_fake_address(&addr).await {
             addr = mapped_addr;
         }
-        let stream =
-            TcpStream::connect_remote_with_opts(context.context_ref(), &addr, connect_opts).await?;
+        let stream = TcpStream::connect_remote_with_opts(context.context_ref(), &addr, connect_opts).await?;
         Ok(AutoProxyClientStream::Bypassed(stream))
     }
 
@@ -99,13 +98,8 @@ impl AutoProxyClientStream {
     where
         A: Into<Address>,
     {
-        AutoProxyClientStream::connect_proxied_with_opts(
-            context.clone(),
-            server,
-            addr,
-            context.connect_opts_ref()
-        )
-        .await
+        AutoProxyClientStream::connect_proxied_with_opts(context.clone(), server, addr, context.connect_opts_ref())
+            .await
     }
 
     /// Connect to target `addr` via shadowsocks' server configured by `svr_cfg`
diff --git a/crates/shadowsocks-service/src/local/net/udp/association.rs b/crates/shadowsocks-service/src/local/net/udp/association.rs
index 13e066097e6f..d58cd6b1c6d1 100644
--- a/crates/shadowsocks-service/src/local/net/udp/association.rs
+++ b/crates/shadowsocks-service/src/local/net/udp/association.rs
@@ -572,8 +572,7 @@ where
                 let svr_cfg = server.server_config();
 
                 let socket =
-                    ProxySocket::connect_with_opts(self.context.context(), svr_cfg, server.connect_opts_ref())
-                        .await?;
+                    ProxySocket::connect_with_opts(self.context.context(), svr_cfg, server.connect_opts_ref()).await?;
                 let socket = MonProxySocket::from_socket(socket, self.context.flow_stat());
 
                 self.proxied_socket.insert(socket)
diff --git a/crates/shadowsocks-service/src/local/redir/tcprelay/mod.rs b/crates/shadowsocks-service/src/local/redir/tcprelay/mod.rs
index b416319c8cb2..3b76a62b6a57 100644
--- a/crates/shadowsocks-service/src/local/redir/tcprelay/mod.rs
+++ b/crates/shadowsocks-service/src/local/redir/tcprelay/mod.rs
@@ -47,7 +47,8 @@ async fn establish_client_tcp_redir<'a>(
     let server = balancer.best_tcp_server();
     let svr_cfg = server.server_config();
 
-    let mut remote = AutoProxyClientStream::connect_with_opts(context, &server, addr, server.connect_opts_ref()).await?;
+    let mut remote =
+        AutoProxyClientStream::connect_with_opts(context, &server, addr, server.connect_opts_ref()).await?;
 
     establish_tcp_tunnel(svr_cfg, &mut stream, &mut remote, peer_addr, addr).await
 }
diff --git a/crates/shadowsocks-service/src/local/socks/server/socks4/tcprelay.rs b/crates/shadowsocks-service/src/local/socks/server/socks4/tcprelay.rs
index fa502d5466b8..ad15a703c757 100644
--- a/crates/shadowsocks-service/src/local/socks/server/socks4/tcprelay.rs
+++ b/crates/shadowsocks-service/src/local/socks/server/socks4/tcprelay.rs
@@ -106,7 +106,7 @@ impl Socks4TcpHandler {
                 self.context,
                 &server,
                 &target_addr,
-                server.connect_opts_ref()
+                server.connect_opts_ref(),
             )
             .await;
             server_opt = Some(server);
diff --git a/crates/shadowsocks-service/src/local/socks/server/socks5/tcprelay.rs b/crates/shadowsocks-service/src/local/socks/server/socks5/tcprelay.rs
index eff5af3c46c0..95659411fb40 100644
--- a/crates/shadowsocks-service/src/local/socks/server/socks5/tcprelay.rs
+++ b/crates/shadowsocks-service/src/local/socks/server/socks5/tcprelay.rs
@@ -258,7 +258,7 @@ impl Socks5TcpHandler {
                 self.context,
                 &server,
                 &target_addr,
-                server.connect_opts_ref()
+                server.connect_opts_ref(),
             )
             .await;
             server_opt = Some(server);
diff --git a/crates/shadowsocks-service/src/local/tun/tcp.rs b/crates/shadowsocks-service/src/local/tun/tcp.rs
index 857271476e34..13ec5841fc17 100644
--- a/crates/shadowsocks-service/src/local/tun/tcp.rs
+++ b/crates/shadowsocks-service/src/local/tun/tcp.rs
@@ -576,7 +576,8 @@ async fn establish_client_tcp_redir<'a>(
     let server = balancer.best_tcp_server();
     let svr_cfg = server.server_config();
 
-    let mut remote = AutoProxyClientStream::connect_with_opts(context, &server, addr, server.connect_opts_ref()).await?;
+    let mut remote =
+        AutoProxyClientStream::connect_with_opts(context, &server, addr, server.connect_opts_ref()).await?;
     establish_tcp_tunnel(svr_cfg, &mut stream, &mut remote, peer_addr, addr).await
 }
 
diff --git a/crates/shadowsocks-service/src/local/tunnel/tcprelay.rs b/crates/shadowsocks-service/src/local/tunnel/tcprelay.rs
index 1ccf55a3ccf0..ea113b44e1cd 100644
--- a/crates/shadowsocks-service/src/local/tunnel/tcprelay.rs
+++ b/crates/shadowsocks-service/src/local/tunnel/tcprelay.rs
@@ -138,12 +138,8 @@ async fn handle_tcp_client(
         svr_cfg.addr(),
     );
 
-    let mut remote = AutoProxyClientStream::connect_proxied_with_opts(
-        context,
-        &server,
-        forward_addr,
-        server.connect_opts_ref()
-    )
-    .await?;
+    let mut remote =
+        AutoProxyClientStream::connect_proxied_with_opts(context, &server, forward_addr, server.connect_opts_ref())
+            .await?;
     establish_tcp_tunnel(svr_cfg, &mut stream, &mut remote, peer_addr, forward_addr).await
 }
diff --git a/crates/shadowsocks-service/src/server/udprelay.rs b/crates/shadowsocks-service/src/server/udprelay.rs
index ea13e6b47cb8..0cc3cb45f675 100644
--- a/crates/shadowsocks-service/src/server/udprelay.rs
+++ b/crates/shadowsocks-service/src/server/udprelay.rs
@@ -648,7 +648,7 @@ impl UdpAssociationContext {
                 return;
             }
 
-            session_context.client_user = control.user.clone();
+            session_context.client_user.clone_from(&control.user);
         }
 
         if let Err(err) = self.dispatch_received_outbound_packet(target_addr, data).await {
@@ -822,7 +822,7 @@ impl UdpAssociationContext {
                 control.client_session_id = client_session.client_session_id;
                 control.server_session_id = self.server_session_id;
                 control.packet_id = self.server_packet_id;
-                control.user = client_session.client_user.clone();
+                control.user.clone_from(&client_session.client_user);
 
                 if let Err(err) = self
                     .inbound
diff --git a/crates/shadowsocks/src/relay/tcprelay/aead.rs b/crates/shadowsocks/src/relay/tcprelay/aead.rs
index 6945502cf84c..4d0c7fc88287 100644
--- a/crates/shadowsocks/src/relay/tcprelay/aead.rs
+++ b/crates/shadowsocks/src/relay/tcprelay/aead.rs
@@ -37,7 +37,6 @@ use std::{
     pin::Pin,
     slice,
     task::{self, Poll},
-    u16,
 };
 
 use byte_string::ByteStr;
diff --git a/crates/shadowsocks/src/relay/tcprelay/aead_2022.rs b/crates/shadowsocks/src/relay/tcprelay/aead_2022.rs
index 5a424c48c22f..c1cd52a7b55e 100644
--- a/crates/shadowsocks/src/relay/tcprelay/aead_2022.rs
+++ b/crates/shadowsocks/src/relay/tcprelay/aead_2022.rs
@@ -51,7 +51,6 @@ use std::{
     sync::Arc,
     task::{self, Poll},
     time::SystemTime,
-    u16,
 };
 
 use aes::{