[ltp] How much performance improvement going from 32-bit to 64-bit linux?

[portsample]

Hey all,

I've recently upgraded to a T60 running a Core 2 Duo T7600 Mobile
Processor (2.33 ghz), lots of RAM and a 7200rpm HD. I am currently
running openSuse 11.1, 32-bit.

I am thinking about installing 64-bit openSuse 11.2 when it is released
in November.

Does anyone have any experience with moving from 32-bit linux OS to
64-bit? 

What kind of performance increase will I see? 

What kind of problems will I have?

Thanks.