It is definitely a problem on CD City. On CD City, my framerate is around 1 or 2 fps. It also jacks up my ping on netgames. I think the issue is caused by lua, but I'm not sure. It is also a small problem on SF94-City. I noticed custom maps that lag really bad on me have lua scripts. It doesn't happen with all maps that have lua scripts though.The question is, what custom maps are you talking about specifically?
I think it is more a limitation with the engine itself, because Doom is really old.From my own experience, not only lua causes lots of lag depending on what's being activated, but sometimes too many sectors and FOFs can cause lag a while section of a level. Best example is the 2.1 version of the Riders Mod, many levels, especially in OGL will induce an unhealthy amount of lag.
many levels, especially in OGL will induce an unhealthy amount of lag.
I used to have a computer that had issues in OpenGL mode. We need to start reporting bugs for SRB2 SDL.Lag in GL is pretty much entirely dependent on your GPU. Not sure why, but it seems GL only performs well with absurdly tough GPUs. I'm using a GeForce GTX 970 and get full frames in all levels consistently.