optimize traffic

app/src/main/java/io/nekohasekai/sagernet/bg/proto/ProxyInstance.kt

@@ -44,7 +44,7 @@ class ProxyInstance(profile: ProxyEntity, var service: BaseService.Interface? =
 
     override fun launch() {
         box.setAsMain()
-        super.launch()
+        super.launch() // start box
         runOnDefaultDispatcher {
             looper = service?.let { TrafficLooper(it.data, this) }
             looper?.start()

app/src/main/java/io/nekohasekai/sagernet/bg/proto/TrafficLooper.kt

@@ -93,8 +93,11 @@ class TrafficLooper
         val itemBypass = TrafficUpdater.TrafficLooperData(tag = TAG_BYPASS)
 
         while (sc.isActive) {
+            proxy = data.proxy
+            if (proxy == null) {
                 delay(delayMs)
-            proxy = data.proxy ?: continue
+                continue
+            }
 
             if (trafficUpdater == null) {
                 if (!proxy.isInitialized()) continue
@@ -175,6 +178,8 @@ class TrafficLooper
             data.notification?.apply {
                 if (listenPostSpeed) postNotificationSpeedUpdate(speed)
             }
+
+            delay(delayMs)
         }
     }
 }