1) Haven't tested this yet, i'm hoping this isn't the case though...!
2) Wakes up pretty quick, no unbarable lag
3) Same as 2) - all seems pretty responsive, no bad lag
4) Never had that issue before, don't expect to get it with the Kaiser :P
5) Nope, although i haven't installed any other apps etc yet...
6) Same as 4)
I can only really compare with the Universal (as that's the only other WM phone i've owned)... my initial impressions are that it's a lot quicker than the Universal... maybe that's partially due to the fact that i haven't installed any bits yet... or really tweaked it.
The 3 second delay was REALLY annoying.... as i'd have to start every phonecall with: "hello....... hello? heeeelllllllllo?" lol... i hope this isnt the case with the Kaiser!
Also i think a lot of the noticable improvements are also due to the fact that im using a vanilla HTC phone, as opposed to a crappy T-mobile 'runined' one! Also i think WM6 has brought in a lot of changes which are noticeably improved over WM5.
EDIT: oh and the only thing that really 'bugs' me - is that i'm used to the lovely VGA Screen of the Universal, so dropping down to QVGA is rather noticable... text looks blockier and using Cleartype seems to make it alot fuzzier than on the Universal.... but that's my only really negative point so far.... hopefully it'll be the ONLY one
EDIT2: Something else i just thought of.... the fact that when my Universal locked up... if i didnt have my Stylus on me (which i usually didnt) and i didnt have a small pin-like object to stick into the reset hole... i was SCREWED... which REALLY pi**ed me off.... countless times i'd be on the train home from work, about to email a friend... only to have my phone lockup... then i'd have to wait an hour before i could reset it and start writing... GRRRRR. Anyway, the Kaiser actually turns off when you hold down the power button... simple... and GREAT! (the power button on the Universal was so stupid.... in my opinion.... was there any way (except by using 3rd party apps) to actually turn the damn thing OFF?! lol)