add some judgement when app lauch first time

ShadowsocksX-NG/AppDelegate.swift

@@ -512,7 +512,9 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
                     serverMenuText += "  - \(latency) ms"
                 }
                 else{
-                    serverMenuText += "  - failed"
+                    if !neverSpeedTestBefore {
+                        serverMenuText += "  - failed"
+                    }
                 }
             }
         }
@@ -622,7 +624,9 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
             if let latency = p.latency{
                 item.title += "  - \(latency) ms"
             }else{
-                item.title += "  - failed"
+                if !neverSpeedTestBefore {
+                    item.title += "  - failed"
+                }
             }
             if mgr.activeProfileId == p.uuid {
                 item.state = 1

ShadowsocksX-NG/PingClient.swift

@@ -131,8 +131,11 @@ class PingServers:NSObject{
     }
     
     
+
     func ping(_ i:Int=0){
         
+        neverSpeedTestBefore = false
+        
         var result:[(Int,Double)] = []
         
         for k in 0..<SerMgr.profiles.count {
@@ -152,6 +155,7 @@ class PingServers:NSObject{
                 }
                 
                 
+                
             })
         }
         //        after two seconds ,time out
@@ -222,3 +226,5 @@ func synchronized(lock: AnyObject, closure: () -> ()) {
 func cancel(_ task: Task?) {
     task?(true)
 }
+
+var neverSpeedTestBefore:Bool = true