While I'm not keen on the way TM are sending/testing new drivers for ViX, I can say that both my TM2T & TMTwin, using build 680 don't suffer these issues.
Fresh flash, AMB for Sky UK & IRE, Cccam 2.3.0 & no noticable delays on start-up viewing any channel.
Saying that, using the drivers included in build 680, the 28% loading screen is once again a pain in the ass on a fresh reboot, can take up to 5 minutes to get past it, once done watching live TV is fine. Could be a HDD check but if so, shouldn't happen every time...