What do you mean by disable? Would a switch or gate work for what you are trying to do? Are you processing really large textures or using multi-sample shaders (blurs, cf.shaders, etc.)? Most likely, if you aren’t noticing any improvements when removing jit.gl.slab from the rendering chain, then that is not your bottleneck. Look elsewhere in your patch. If you are having trouble getting your patch to perform at appropriate speeds, you can post your patch up here and see if anyone can offer suggestions.