Quite slow, not blaming you for anything, you're doing all you can obviously ;P
I have roughly 460 songs now. Album cover looks nice and big. A huuuge plus for me to you. Only annoying thing is the images look low-res when they're stretched, and sometimes wrong cover art shows up. And the identify, how does it work?

Anyways, A+ dude, I hope you can make it run faster and you can choose your own cover art!