[topfs2]

Well the shaders in shadertoy in browser runs at 800x480 and in kodi you run it at 1920x1080, the latter needs about 5.4 more power, which can very well cause it to grind to a halt.

TBH I am considering adding a setting to render it to texture (800x480 or something) and then use linear scaling up to full HD. It won't look as nice but should run on a lot more hardware

But, I do think something is off with the rendering because I have a full out gaming rig and it doesn't feel like 60fps to me ever. The rest of the Kodi GUI runs fluid (with and without shadertoy visualizer on) but the actual visualizer feels slower. My issue could be audio data feed though.