From Gizmodo :
I’m still working on the full review, but I wanted to give everyone an update on that performance fix that was released last week for the HTC Touch Diamond. I installed the new ROM (it was easy, just run the executable on your PC), and now TouchFLO is noticeably faster. It’s still not instant, but it’s definitely improved to the point where it’s usable and you won’t really mind it. Yeah, it’s passed that bar. I’d even say that it’s just as fast as the iPhone. Current owners will be able to upgrade to the newer official ROM soon.