Use scale transformation instead of shadereffectsource. Faster when reducing quality.

app/qml/TerminalContainer.qml

@@ -24,23 +24,10 @@ Item{
             opacity: shadersettings.windowOpacity * 0.3 + 0.7
             z: 1.9
         }
-    }
 
-    // This is used to render the texture to a lower resolution then scale it up.
-    Loader{
-        id: scalableContentSource
-        active: shadersettings.window_scaling < 1
-        sourceComponent: ShaderEffectSource{
-            sourceItem: scalableContent
-            hideSource: true
-            smooth: true
-        }
-    }
-    Loader{
-        active: shadersettings.window_scaling < 1
-        anchors.fill: parent
-        sourceComponent: ShaderEffect{
-            property var source: scalableContentSource.item
+        transform: Scale {
+            xScale: 1 / shadersettings.window_scaling
+            yScale: 1 / shadersettings.window_scaling
         }
     }