The hint in slimstock thread to change the sd read ahead settings helped me a lot. Since I changed it to 128k everything runs perfect. Even Chrome is stable. No more lags. Although I have a class 10 sd card. I thought this should be fast enough...
You should put this in your faq.
About lag: for me everything is working fine, except Chrome. Especially with 3g it stops working for about 10s. Doesn't react at all. This site is fast with stock browser but very slow with chrome.
Thx for your work, I will stay on this rom.