All you need to know: http://blogs.adobe.com/toddkopriva/2011/02/optimizing-for-performance-adobe-premiere-pro-a nd-after-effects.html. Still, AE using just one core may be perfectly normal. Such things depend a lot on teh specific effects and features used...
Thanx, for now :-). Perhaps I will come back with questions!
First of all, thanks for your quick reply on my previews post.
BUT, after reading a lot and watching the videos of Video2brain, I realized that everybody is talking about cs5. As I posted before... I have sc4. When I preview something in after ALL of my cores are working in order to render my preview. When I render my project things are different. Again I have the picture of 1 core rendering.
Can I do something about that? Or, if I wanna use all of my cores I have to upgrade to cs5?
Thank you in advanced
The short answer: no. You only have 3 gigs of memory. If you're resolved to remain on AE 9 and XP, do yourself a favor and get an additional gig. But you still won't be able to use multiprocessing to any great extent.
And read that link Mylenium gave you.
While you should definitely upgrade to CS5 (it's 64-bit!) to take advantage of all the power your machine can have (assuming you've got a decent one), you might be able to get AE to render with more cores. Go into your preferences. I don't remember what it was called on CS4, but there was a memory and multiprocessing section. Play with the settings there. Now, I don't know how much RAM you have, but you're gonna want 8 GB or more to really mess with this.