diff --git a/README-EN.md b/README-EN.md
index f7ebc78..f4a072c 100644
--- a/README-EN.md
+++ b/README-EN.md
@@ -33,34 +33,31 @@ $ cargo install fourth
 
 ## Configuration
 
-Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, here is an example:
+Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, here is an minimal viable example:
 
 ```yaml
 version: 1
 log: info
 
 servers:
-  example_server:
-    listen:
-      - "0.0.0.0:443"
-      - "[::]:443"
-    tls: true # Enable TLS features like SNI
-    sni:
-      proxy.example.com: proxy
-      www.example.com: nginx
-    default: ban
-  relay_server:
+  proxy_server:
     listen:
       - "127.0.0.1:8081"
     default: remote
 
 upstream:
-  nginx: "127.0.0.1:8080"
-  proxy: "127.0.0.1:1024"
-  remote: "www.remote.example.com:8082" # proxy to remote address
+  remote: "tcp://www.remote.example.com:8082" # proxy to remote address
 ```
 
-Built-in two upstreams: ban(terminate connection immediately), echo
+Built-in two upstreams: ban(terminate connection immediately), echo. For detailed configuration, check [this example](./example-config.yaml).
+
+## Performance Benchmark
+
+Tested on 4C2G server:
+
+Use fourth to proxy to Nginx(QPS of direct connection: ~120000): ~70000 req/s (Command: `wrk -t200 -c1000 -d120s --latency http://proxy-server:8081`)
+
+Use fourth to proxy to local iperf3: 8Gbps
 
 ## Thanks
 
diff --git a/src/servers/protocol/kcp.rs b/src/servers/protocol/kcp.rs
index f587431..c5d3028 100644
--- a/src/servers/protocol/kcp.rs
+++ b/src/servers/protocol/kcp.rs
@@ -67,31 +67,33 @@ async fn process(
     match upstream {
         Upstream::Ban => {
             let _ = inbound.shutdown();
-            Ok(())
         }
         Upstream::Echo => {
             let (mut ri, mut wi) = io::split(inbound);
             let inbound_to_inbound = copy(&mut ri, &mut wi);
             let bytes_tx = inbound_to_inbound.await;
             debug!("Bytes read: {:?}", bytes_tx);
-            Ok(())
         }
         Upstream::Custom(custom) => {
-            let outbound = TcpStream::connect(custom.addr.clone()).await?;
+            match custom.protocol.as_ref() {
+                "tcp" => {
+                    let outbound = TcpStream::connect(custom.addr.clone()).await?;
 
-            let (mut ri, mut wi) = io::split(inbound);
-            let (mut ro, mut wo) = io::split(outbound);
+                    let (mut ri, mut wi) = io::split(inbound);
+                    let (mut ro, mut wo) = io::split(outbound);
 
-            let inbound_to_outbound = copy(&mut ri, &mut wo);
-            let outbound_to_inbound = copy(&mut ro, &mut wi);
+                    let inbound_to_outbound = copy(&mut ri, &mut wo);
+                    let outbound_to_inbound = copy(&mut ro, &mut wi);
 
-            let (bytes_tx, bytes_rx) = try_join(inbound_to_outbound, outbound_to_inbound).await?;
+                    let (bytes_tx, bytes_rx) = try_join(inbound_to_outbound, outbound_to_inbound).await?;
 
-            debug!("Bytes read: {:?} write: {:?}", bytes_tx, bytes_rx);
-
-            Ok(())
+                    debug!("Bytes read: {:?} write: {:?}", bytes_tx, bytes_rx);
+                }
+                _ => {}
+            }
         }
-    }
+    };
+    Ok(())
 }
 
 async fn copy<'a, R, W>(reader: &'a mut R, writer: &'a mut W) -> io::Result<u64>
diff --git a/src/servers/protocol/tcp.rs b/src/servers/protocol/tcp.rs
index 2340881..99465bd 100644
--- a/src/servers/protocol/tcp.rs
+++ b/src/servers/protocol/tcp.rs
@@ -86,31 +86,33 @@ async fn process(
     match upstream {
         Upstream::Ban => {
             let _ = inbound.shutdown();
-            Ok(())
         }
         Upstream::Echo => {
             let (mut ri, mut wi) = io::split(inbound);
             let inbound_to_inbound = copy(&mut ri, &mut wi);
             let bytes_tx = inbound_to_inbound.await;
             debug!("Bytes read: {:?}", bytes_tx);
-            Ok(())
         }
         Upstream::Custom(custom) => {
-            let outbound = TcpStream::connect(custom.addr.clone()).await?;
+            match custom.protocol.as_ref() {
+                "tcp" => {
+                    let outbound = TcpStream::connect(custom.addr.clone()).await?;
 
-            let (mut ri, mut wi) = io::split(inbound);
-            let (mut ro, mut wo) = io::split(outbound);
+                    let (mut ri, mut wi) = io::split(inbound);
+                    let (mut ro, mut wo) = io::split(outbound);
 
-            let inbound_to_outbound = copy(&mut ri, &mut wo);
-            let outbound_to_inbound = copy(&mut ro, &mut wi);
+                    let inbound_to_outbound = copy(&mut ri, &mut wo);
+                    let outbound_to_inbound = copy(&mut ro, &mut wi);
 
-            let (bytes_tx, bytes_rx) = try_join(inbound_to_outbound, outbound_to_inbound).await?;
+                    let (bytes_tx, bytes_rx) = try_join(inbound_to_outbound, outbound_to_inbound).await?;
 
-            debug!("Bytes read: {:?} write: {:?}", bytes_tx, bytes_rx);
-
-            Ok(())
+                    debug!("Bytes read: {:?} write: {:?}", bytes_tx, bytes_rx);
+                }
+                _ => {}
+            }
         }
-    }
+    };
+    Ok(())
 }
 
 async fn copy<'a, R, W>(reader: &'a mut R, writer: &'a mut W) -> io::Result<u64>