Latest versions of WookieChat work better under OS4.
The delay when clicking between different chanels under 3.9 doesn't exist under 4.0.
If you're referring to the latest beta, I've tried to improve the tab switching speed by making it only update the display once instead of a few times rapidly. My code was a bit buggy unfortunately, but I've only just started to realise why it acted that way. It used to look like a brief flicker on fast machines, but it was quite painful on slower machines. But yes, I believe I've solved that issue now.