/vr/ - Retro Games

NEED SOME HELP LADS
TL;DR How do you limit particles/whatever rendered at once in Skulltag?

I'm trying to run GREZZO2 - 2014 Anniversary edition but every time I get to the first Jesus fight it crashes when he starts shooting loads of shit (pic related).
It also crashes when there's a large number of enemies on screen all shooting at once.
These crashes only happen in the OpenGL renderer (software renderer lags like hell so screw using that) which runs flawlessly until, well, it crashes.
I have a feeling that Skulltag's OpenGL renderer is getting overloaded with the sheer particles on screen at once, so is there a way to limit?

I would upgrade to Zandronum but I don't know how to get GREZZO2 running in that, it comes with a bunch of .pk3's and .wads and shit.