I posted this in somebody else post, so its buried somewhere that it will be difficult to find.
so, here it comes:
When i transfered my contacts and sms to my TP2 form the crapy TP1, the phone (TP2) was extremely laggy and sometimes non responsive for minutes.
Now, lets not blame Windows or HTC because I have few thousand sms in there
So, I switched from Threated to Classic (start\settings\system\text messaging)
and the lag went away immediately (after restart).
Of-course you looses the functionality of having the SMS from one person in under one SMS.
If I had to guess why this happens, i would probably say that loading a single SMS in Threated mode loads all the SMS from that contact and thus the phone gets bogged down.
However, I am not expert by any means and it would be nice if a cook can enlighten us.
thanks