I posted my computer specs earlier, here: Athlon XP 2100+ (1,73ghz), 512mb ram (333mhz), Radeon 9600 Pro (256mb).

The slowdowns (and by this I mean I cannot even move) I get comes about every two seconds when I move and it's worst, when there are NPC's around. For example, LAB A is jerky as hell, when the agents are around, but when they are dead, the game runs a bit smoother without total slowdowns.

You mentioned something about the Radeon cards, does the issue lie there? I haven't got problems in other games, which have somewhat same system requirements compared to MothersDen what-so-ever. Does the resolution affect much, since I usually play everything with 1024x768? Anyway, I'll update the drivers and get back to you.

If this doesn't prevent participating in the beta, I'll help.

Edit: Ok, I updated the display drivers and it's actually quite playable now, but I still get nasty loadings, probably when it's loading new areas. Fire fights are quite jerky aswell. Anyway, that's probably as good as it's going to get.