diff --git a/app/Display/VisualControl.cs b/app/Display/VisualControl.cs
index f29730c4..400d18ce 100644
--- a/app/Display/VisualControl.cs
+++ b/app/Display/VisualControl.cs
@@ -37,7 +37,7 @@ namespace GHelper.Display
         private static bool _init = true;
         private static string? _splendidPath = null;
 
-        private static System.Timers.Timer brightnessTimer = new System.Timers.Timer(100);
+        private static System.Timers.Timer brightnessTimer = new System.Timers.Timer(200);
 
         public const int DefaultColorTemp = 50;
         static VisualControl()
diff --git a/app/Settings.cs b/app/Settings.cs
index d4f9aa0d..91cec26f 100644
--- a/app/Settings.cs
+++ b/app/Settings.cs
@@ -274,6 +274,7 @@ namespace GHelper
                 sliderGamma.Visible = true;
                 VisualiseBrightness();
                 sliderGamma.ValueChanged += SliderGamma_ValueChanged;
+                sliderGamma.MouseUp += SliderGamma_ValueChanged;
             }
 
             if (!dimming) labelGammaTitle.Text = Properties.Strings.ViualMode;