Stock phone performance.
I've only had my phone for a week now, but overall it performs great. I really only noticed lag when I started noticing how much people were talking about it. Don't get me wrong, when I get more familiar with the Android OS I'm going to root this baby to hell, but for now it's great. I did notice some lag when swiping on the desktop, but I had this huge clunky "Daily Briefing" news widget that seemed to be the culprit.
I'm going to at least wait until Froyo comes to Telus and see how that improves the speed of the phone. From what I've read I shouldn't really expect much, but you never know.
I'd like to hear about how other peoples' phones are behaving.