yes, unlike the doom3 engine, the source engine is hella optimized and is easy on the comp. hell i remember i could run HL2 beta (back in da day) with my 1.2 ghz, 384mb ram, and geforce mx 100/200 32 mb card at 800x600 medium settings and i got in the 22fps range. can't wait for the proper release.
Bookmarks