I have 2 problems left:
1) Lots of microwarps, especially when I get close to the opponent: it looks similar to WB stick stirring, but since no stick stirring is possible here ("Don't move your controls so rapidly") it must be related with the game itself. I had no such kind of problem in AH1.
2) I still have lots of freezes, not necessarly when meeting new contacts.
AH2 settings:
1280*1024
Details and rendering distance: sliders at about 50%
Textures res:1024
System:
Win XP SP1 - DX 9.1
AMD 2.4+
1GB RAM 266
Abit KD7
ATI Radeon 9600pro/256 (wxp-w2k-catalyst-8-02-040515a-015958c drivers)
On board C-media audio + Avance AC97 addon audio board.