I'm running SlimKat in Slot 1. That's the only custom ROM I have installed. But it's just as slow if I boot the stock rom (and was before I rooted or did any customizing).
When I get a call, it rings several times before the screen wakes up so I can answer it. A couple times, the call has gone to voicemail before the screen woke up so I could answer the call. The capacitive buttons light up, it vibrates, the ringtone plays, but the screen stays dark until the 3rd ring.
Sometimes it takes 10 or 15 seconds just to get the keyboard to come up when I touch a text entry box. Doesn't matter what app or what keyboard I use.
Sometimes it takes so long for it to respond to a touch that I don't know if it registered my touch so I touch the screen again then a few seconds later it registers both touches which totally screws up whatever I was trying to do and I have to start over.
Sometimes I just want to throw this thing against a brick wall. It would be very satisfying to watch it shatter into pieces. It's frustrating me so much, I'm seriously thinking of borrowing a friend's old iPhone... Just typing that made me feel dirty, but that's how bad it is.
I don't see anybody else complaining. What's wrong with my phone?