diff --git a/v2rayN/ServiceLib/Global.cs b/v2rayN/ServiceLib/Global.cs
index 009985d7..7f645ddc 100644
--- a/v2rayN/ServiceLib/Global.cs
+++ b/v2rayN/ServiceLib/Global.cs
@@ -92,13 +92,14 @@ public class Global
     public const string XrayLocalAsset = "XRAY_LOCATION_ASSET";
     public const string XrayLocalCert = "XRAY_LOCATION_CERT";
     public const int SpeedTestPageSize = 1000;
+    public const int SpeedTestConcurrencyCountMin = 10;
     public const string LinuxBash = "/bin/bash";
     public const string StringTrue = "true";
     public const string StringFalse = "false";
     public const int SqliteMaxBatchSize = 10000;
     public static readonly TimeSpan LocalFetch = TimeSpan.FromSeconds(5);
     public static readonly TimeSpan DirectFetch = TimeSpan.FromSeconds(10);
-    public static readonly TimeSpan ProxyFetch  = TimeSpan.FromSeconds(30);
+    public static readonly TimeSpan ProxyFetch = TimeSpan.FromSeconds(30);
     public static readonly TimeSpan DirectDownloadConnect = TimeSpan.FromSeconds(5);
     public static readonly TimeSpan ProxyDownloadConnect = TimeSpan.FromSeconds(10);
 
diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index b9b27dbb..68c7f490 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -136,10 +136,7 @@ public static class ConfigHandler
         {
             config.SpeedTestItem.SpeedPingTestUrl = Global.SpeedPingTestUrls.First();
         }
-        if (config.SpeedTestItem.MixedConcurrencyCount < 1)
-        {
-            config.SpeedTestItem.MixedConcurrencyCount = 5;
-        }
+        config.SpeedTestItem.MixedConcurrencyCount = Math.Max(config.SpeedTestItem.MixedConcurrencyCount, Global.SpeedTestConcurrencyCountMin);
         if (config.SpeedTestItem.UdpTestTarget.IsNullOrEmpty())
         {
             config.SpeedTestItem.UdpTestTarget = Global.UdpTestTargets.First();
diff --git a/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml.cs b/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml.cs
index 8f8e609d..b2f02a21 100644
--- a/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml.cs
@@ -47,7 +47,7 @@ public partial class OptionSettingWindow : WindowBase<OptionSettingViewModel>
         cmbCoreType7.ItemsSource = Global.CoreTypes;
         cmbCoreType9.ItemsSource = Global.CoreTypes;
 
-        cmbMixedConcurrencyCount.ItemsSource = Enumerable.Range(2, 7).ToList();
+        cmbMixedConcurrencyCount.ItemsSource = Enumerable.Range(Global.SpeedTestConcurrencyCountMin, 20).ToList();
         cmbSpeedTestTimeout.ItemsSource = Enumerable.Range(2, 5).Select(i => i * 5).ToList();
         cmbSpeedTestUrl.ItemsSource = Global.SpeedTestUrls;
         cmbSpeedPingTestUrl.ItemsSource = Global.SpeedPingTestUrls;
diff --git a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
index b974ef14..e1dbecd5 100644
--- a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
@@ -43,7 +43,7 @@ public partial class OptionSettingWindow
         cmbCoreType7.ItemsSource = Global.CoreTypes;
         cmbCoreType9.ItemsSource = Global.CoreTypes;
 
-        cmbMixedConcurrencyCount.ItemsSource = Enumerable.Range(2, 7).ToList();
+        cmbMixedConcurrencyCount.ItemsSource = Enumerable.Range(Global.SpeedTestConcurrencyCountMin, 20).ToList();
         cmbSpeedTestTimeout.ItemsSource = Enumerable.Range(2, 5).Select(i => i * 5).ToList();
         cmbSpeedTestUrl.ItemsSource = Global.SpeedTestUrls;
         cmbSpeedPingTestUrl.ItemsSource = Global.SpeedPingTestUrls;