Same problems after 1.55 patch. About 20 percent of fps gone away. Plus, random stuttering, LOD changing, performance degrading.
The specs are the following:
Windows XP, Core2Duo E8500, Ati4850, 2GB.
Tried the latest VGA driver and DirectX, without success.
Tried under fresh Win7 installation, a little bit better, but almost same results.
And finally, an interesting issue:
The base ArmA2 1.08 runs well, without these issues.
So, now i am are waiting for the fix, that will fix this "so-called optimization" in patch 1.55