Another thing comes to mind: when the screen eventually wakes up, it takes another couple of seconds before my contact's name is displayed, before that I only get the phone number.
Anybody else experiencing this problem: When I get an incoming call, it takes an awful lot of time before the screen wakes up and I can answer the call. This only started to happen recently. I'm talking like at least five seconds when it's already ringing. I'm on FB's Valhalla Rom, with Anton's kernel installed.