My first Android device is an Xperia X10 Mini. I've installed a custom ROM (miniCm7) and now my device is definitely 'cool'.
The only problem is that a lot of applications run in the background, slowing down the phone. Xperia x10 mini has a 600 MHz processor and only 256 MB RAM, so it can manage few applications altogether, despite they are applications I need (for example: WhatsApp, Facebook, Dropbox, and more).
How do I speed up and maintain it clean?