diff --git a/src/Server.kt b/src/Server.kt
index 2bf3997..08a24fc 100644
--- a/src/Server.kt
+++ b/src/Server.kt
@@ -6,6 +6,7 @@ import java.net.ServerSocket
 import java.net.Socket
 import java.util.*
 import java.util.concurrent.CopyOnWriteArrayList
+import kotlin.system.measureTimeMillis
 
 var clientAudios: MutableList<ClientAudio> = CopyOnWriteArrayList()
 
@@ -24,11 +25,14 @@ fun main() = runBlocking {
 
             for (client in clientAudios) {
                 launch(Dispatchers.IO) {
-                    for (audio in clientAudios) {
-                        if (audio != client)
-                            audio.mix(client.sample)
+                    val t = measureTimeMillis {
+                        for (audio in clientAudios) {
+                            if (audio != client)
+                                audio.mix(client.sample)
+                        }
+                        client.send()
                     }
-                    client.send()
+                    println("server send time: $t")
                 }
             }
         }