Sorry if this has already been covered, but there's a big issue I'm having-
Radiant is unusable because of excessive lag- I can't move around the 3d view, it stalls for almost 30 seconds before showing a new brush I made, and these things make is absolutely impossible to map.
This is weird because I just installed this on a brand new custom built computer. It has 8gigs ram, a 3.0ghz dual core amd processor and an nvidia 9800gt gcard- this setup runs crysis, tremulous, half life etc absolutely fine- so why the hell is radiant so laggy?
The operating system is 64bit windows vista.