One thing that fustraights me so much about some N900 users... Its NOT a SYMBIAN based phone, or an iPhone with iPhoneMacOS, it is an internet tablet running LINUX and should be treated as such.

The more stuff you put on a linux or windows desktop application wise, the more it will slow down.

Symbian applications are not as complex as a Maemo linux application, less lines of code etc.

If you want a superfast no lag device with no issues and perfect firmware from day dot, don't buy an N900.

Performance will improve over time as code is cleaned up and bugs are ironed out in future releases.