diff --git a/v2rayN/ServiceLib.Tests/Services/SpeedtestServiceResultTests.cs b/v2rayN/ServiceLib.Tests/Services/SpeedtestServiceResultTests.cs
new file mode 100644
index 00000000..491203a6
--- /dev/null
+++ b/v2rayN/ServiceLib.Tests/Services/SpeedtestServiceResultTests.cs
@@ -0,0 +1,26 @@
+namespace ServiceLib.Tests.Services;
+
+public class SpeedtestServiceResultTests
+{
+    [Test]
+    [Arguments(ESpeedActionType.Speedtest, 0)]
+    [Arguments(ESpeedActionType.Mixedtest, 0)]
+    [Arguments(ESpeedActionType.Realping, 12.5)]
+    public async Task StartingATest_ShouldClearTheLastSpeedOfSpeedTests(ESpeedActionType actionType, double expected)
+    {
+        var indexId = Guid.NewGuid().ToString();
+        ProfileExManager.Instance.SetTestSpeed(indexId, 12.5m);
+
+        await SetTestResult([new() { IndexId = indexId }], actionType, ResUI.Speedtesting);
+
+        var profileEx = (await ProfileExManager.Instance.GetProfileExs()).First(t => t.IndexId == indexId);
+        await profileEx.Speed.Should().BeEqualTo((decimal)expected);
+    }
+
+    private static Task SetTestResult(List<ServerTestItem> items, ESpeedActionType actionType, string message)
+    {
+        var service = new SpeedtestService(new Config { SpeedTestItem = new() }, _ => Task.CompletedTask);
+        var method = typeof(SpeedtestService).GetMethod("SetTestResultAsync", BindingFlags.Instance | BindingFlags.NonPublic)!;
+        return (Task)method.Invoke(service, [items, actionType, message])!;
+    }
+}
diff --git a/v2rayN/ServiceLib/Services/SpeedtestService.cs b/v2rayN/ServiceLib/Services/SpeedtestService.cs
index a5155589..ef5c4582 100644
--- a/v2rayN/ServiceLib/Services/SpeedtestService.cs
+++ b/v2rayN/ServiceLib/Services/SpeedtestService.cs
@@ -188,10 +188,13 @@ public class SpeedtestService(Config config, Func<SpeedTestResult, Task> updateF
                     break;
 
                 case ESpeedActionType.Speedtest:
+                    // A skipped or failed test must not leave the last speed behind for sorting.
+                    ProfileExManager.Instance.SetTestSpeed(it.IndexId, 0);
                     await UpdateFunc(it.IndexId, "", message);
                     break;
 
                 case ESpeedActionType.Mixedtest:
+                    ProfileExManager.Instance.SetTestSpeed(it.IndexId, 0);
                     await UpdateFunc(it.IndexId, message, message);
                     break;
             }