Hi guys (watching you for a long time but registered just today)...
You have very good forum here, and without your knowledge base I would be moron about Android OS (in general, after that in flashing firmware
).
Anyway, to stop being OT - here is my two cents about phone slowness after 1.6 update:
If you experience that phone gradually over time of being used, then you have checked in Settings under Security & Location -> Use wireless networks and Share with Google. So, uncheck them!
p.s- I have the same issue before unchecking that options, now the OS flying!!! Ahh, yes... excuse me if my english is wrong - I am SERBIAN.