Dynamic Light Lag and Crash

[PhantomDoom741]

Hey there, I'm experiencing a quite annoying problem on my Mac: GZDoom crashes whenever I use OpenGL Dynamic Lights for some time.
Also, this problem puts me big limits to the mods I can play, depending if they rely on Dynamic Lights or not.

More precisely, at first the FPS stay around 50-60 FPS (my default framerate), but after a few seconds, the framerate starts to drop to 16-35 FPS. From this point on, random huge frame drops (reaching 1 FPS for some seconds) start to occur, and eventually the game crashes, leaving the log you can find here.
This happens more often when I use flashlights (example: MetaDoom's Pistol Flashlight) and happens on all mappacks.
The problem doesn't show itself in Software Mode's Dynamic Lights, in Zandronum's OpenGL renderer, or without enabling OpenGL Dynamic Lights in GZDoom.
I'm experiencing this issue since I first downloaded GZDoom (which was a few versions before 2.3.2), so this makes me think it's a problem with my computer.

Thanks in advance!

[Graf Zahl]

... on my Mac...

That says it all, unfortunately. Apple's OpenGL implementation is one of the worst in existence, so bad in fact that Apple just threw in the towel and deprecated it. I'm afraid that before I find the time and do a Vulkan backend that then could use MoltenVK on Macs there is little chance that anything can be done here.

[_mental_]

Did you try on something newer than El Capitan? Apparently, your iMac supports High Sierra.

[Graf Zahl]

No feedback and a crash deep in the graphics driver. I suspect something else at fault.