Well, at the moment I'm in the process of acquiring some new gear to upgrade (Ie: Mobo, RAM, Gfx), so I can play GE more smoothly.
Here's what I'm running in my current rig:
2.66Ghz Intel Celeron D Processor (Single Core), 512mb DDR2 RAM, Integrated Graphics, Asus P5VDC-MX mobo.
A real shit box at the moment, but here's the kicker. I can run GE:S Beta 1.1h on medium graphics, on 1024 x 768 screen resolution.
The only levels I can play WITHOUT lag, are Temple and its variants, ie: Temple Classic, MK-A2, MK-A5; Complex and its variants, Egyptian, Library Classic, Carrington Institute (with lag from time to time), Caves, and Citadel.
The ones that lag so bad its not even worth playing are Siberia, Cradle, Control, Facility and its variants, Bunker, and Archives.
Thats the reason why you may see me leave server if the map changes to those.
Anways, bottom line is on some maps I can run GE:S reasonably well. But when I get my new gear, I'll say goodbye to LAG with any map!
Good stuff.