ToME: the Tales of Maj'Eyal

I was wondering if anyone else experiences slowdowns only with certain effects, like the one that attacks again upon killing an enemy on doombringer. My game is pretty smooth except for those. I'm running a 15" touchbar macbook pro, which is not very old and was top of the line when I got it, so I'm surprised that these tiny graphical effects are causing so much slowdown. Has anyone found a solution? I've tried turning off the advanced graphics options and it doesn't seem to matter much.

I've narrowed it down to the OpenGL Shaders. Is this a known issue?

OpenGL is badly supported by some cards/drivers. So what is likely happening is that your drivers are missing a specific feature and your gfx card is doing it the hard way.

I'm not a mac person, so I'm not sure if you can update drivers or how to check what OpenGL components you have included.