Sorry for the delay in replying.
It was using the default appear1 script. I'll try your appear1cull script.
This is embarassing! Before I installed your mod, the frame-rate in the outdoor level was between 1 fps and 8 fps. After it was installed, it was between just under 5 fps, to just over 10 fps!!
The problem isn't with your mod, or even with FPSC, it's with my old computer; it can only just, at a push, handle light mapping, shaders and textures set to full.
This is the primary reason why I'm trying out your mod, to see if I can squeeze any more fps out of my dinosaur pc!
I should also point out that the 6 levels of the game I am currently developing vary greatly in their respective frame-rates. It varies from the shocking frame-rate I've already mentioned for the big outdoor level, to around 23/24 fps for a small, unfinished indoor level with water, but not many entities.
The odd thing is, however, the way that the outdoor level varies in its frame-rate, depending on where I am in the level and what direction I'm facing! It varies from between less than 5 fps to only just over 10 fps!! I've been spending the last few days going through the level trying to figure what is causing such a dramatic drop in frame-rate, but as yet I've been unsuccessful.