Any more performance tips?
When I played this more seriously, I had a series of performance tweaks to be made on armyops.ini. I am not sure, but I remember that the game did not use the last version of directx by default (or smt like that) and it was possible to swap that (the most immediate result is that we would see a progress bar while loading the maps).
Furthermore, what ingame definitions have a bigger implication on fps (namely, anti-aliasing,v-sync, projectors, decals, etc)? Which have none?
Concerning sound, which of the options should I use in the menu (HW?)?
My desktop pc is the following:
A8N-E
AMD 3200+
1,5gb RAM
7600GT,
You have a lot of questions

AA uses DirectX 8 by default. Me and others have tried to get DX9 working but the libraries in AA are all linked together and it has to be compiled with the AA binary and other files. Basically, it won't work. I would highly doubt that you would see a progress bar while loading the maps. If you have proof, I would love to see it.
Heavy Anti-Aliasing will be a detriment to FPS but a little bit shouldn't really hurt unless you have an onboard graphics card or a pretty old one. It might hurt pretty good in your case. I'm running a 8600GT with 256MB of RAM and cranking Anti-Aliasing to full knocks FPS down almost to the point where it's not playable. You can probably run minimal Anti-Aliasing on a Nvidia 9xxx series card or higher without any ill effect on FPS.
VSync shouldn't hurt FPS. What it does is, it cuts your FPS to your monitors refresh rate. A lot of people think that if they have 200 FPS that it's so much better than 60. It's not. The fact is, you can't see any more frames than what your monitor is producing via it's refresh rate. Most monitors are can do 60. Some will do 75 at lower resolutions. Some TV's will do 120 or 240 or even higher with some of the fancy ones. VSync matches the FPS of your graphics card with your monitor's refresh rate. This eliminates tearing. Look at gunfire in AA or a flickering light, you'll notice that you see a cut in it or it becomes uneven every so often. It's a bad problem with AA and other games on the Unreal engine. It doesn't really hurt anything. Enabling VSync just gives smoother visuals.
Projectors and decals are the same thing, just used for different purposes. In AA, projectors would be the black marks left from explosions. Decals are mostly used for bullet holes. With low end graphics cards or onboard video, disabling them gives a pretty good performance boost. But pretty much any "modern" graphics card can handle them easily. Your 7600GT should be no exception to that.
If you or anyone else wants to raise FPS. There's 2 major things you can do that are pretty cheap these days:
- Get the fastest clock CPU you can.
Pepe, in your case that would be upgrading to a dual core Athlon 64 X2 4400+ this:
http://www.ebay.com/itm/AMD-Athlon-64-4400-X2-939-DUAL-CORE-ADV4400DAA6CD-/140896675708?pt=CPUs&hash=item20ce18a77cThe dual core wouldn't necessarily help in AA but it would mean that the other things on your computer would have another core to use while AA uses the other. On this note, you can also set AA to run at a higher process priority. Don't expect massive improvements with that.
- Get away from onboard graphics. Cheap PCI-E cards are available for under $40, even less finding them used. AGP cards are older and should be even cheaper.
Those two things will give you more performance than any amount of tweaking. You could put $60 into your computer and have insane increases in performance.