diff --git a/v2rayN/ServiceLib/Services/SpeedtestService.cs b/v2rayN/ServiceLib/Services/SpeedtestService.cs
index d5f10871..c1a7de38 100644
--- a/v2rayN/ServiceLib/Services/SpeedtestService.cs
+++ b/v2rayN/ServiceLib/Services/SpeedtestService.cs
@@ -210,6 +210,7 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
 
             var parallelOptions = new ParallelOptions
             {
+                MaxDegreeOfParallelism = lst.Count,
                 CancellationToken = ct,
             };
 
@@ -291,6 +292,7 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
 
             var parallelOptions = new ParallelOptions
             {
+                MaxDegreeOfParallelism = selecteds.Count,
                 CancellationToken = ct,
             };
 
@@ -381,6 +383,7 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
 
             var parallelOptions = new ParallelOptions
             {
+                MaxDegreeOfParallelism = selecteds.Count,
                 CancellationToken = ct,
             };
 
@@ -570,6 +573,10 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
             await clientSocket.ConnectAsync(endPoint, linkedCts.Token).ConfigureAwait(false);
             responseTime = (int)timer.ElapsedMilliseconds;
         }
+        catch
+        {
+            // Ignore
+        }
         finally
         {
             timer.Stop();