Win XP 64-bit version - performance increase

OK, before anybody gets angry, I already found a thread discussing Win XP 64-bit, but got a comment to not bring old threads alive again. Also got comments previously about not bringing up "new" threads that have already being discussed. So now I am a little bit confused about the rules here. Topic has already been up, but I would like an update, so I hope I'm not going against the rules with this thread?

How many people out there have installed Win XP 64-bit? How big was the performance increase compare to the 32-bit version? Just a slight increase, or a really big increase?
What about 64-bit specific written applications? Anyone installed something where you can really tell the difference? (like some heavy duty 3D program or something?)

Thanks!

IF you have a Question, make a new thread, if you have a stupid comment, just don't post, if you have a good educational comment, post in the old thread.

Didn't get a chance to try 64 yet :(.

Check on Google for benchmark!

For 32 bits application, their is less or plus 5% performance.
For 64 bits appliication, the performance is way up versus same application in 32 bits.