Fix slow custom brushes

So I got really tired of my custom brushes being extremely slow and chunky while using my pen tablet in Gimp. I finally figured out how to eliminate most of the slowness, and still use my pen tablet.

1-Go to preferences.
Click 'preferences' in the Edit menu at the top.


2-Image window
Click on 'Image window' and change the following preferences as indicated below:




3-Paint on
Now you should be able to paint with very little lag. (If you create a brush with 20 layers or its just plain massive, over 300 dpi, it will still be slow).
The only downside to this is you no longer see a preview of your paintbrush tip. But I find this a minor annoyance is worth the price to be able to make bold broad strokes on your canvas.
Paint on! Paint on!