MacBook slow Wifi (file copying)

Hi there,
I'm running a 802.11n 2,4GHz Wifi at home. My Mac Mini (2011) and Macbook (2007, white) connect to my network using it. My server is connected through gigabit LAN.
Using my Mini I get very decent speeds copying files, a 700MB file takes just a few seconds to copy. But using my Macbook speeds are incredibly slow.
The same file takes minutes to copy.
I've tried changing the Wifi channel and also the router without success. It seems to be a problem with my MacBook. It's running 10.6.8. Had 10.7.4 installed before, wasn't better. The Mini of course runs 10.7.4.
I also remember connecting the MacBook to a friends Wifi in 2008 who already had 802.11n and it was ultra fast. So it should be able to handle it.
Any ideas on how I can get better speeds?
Tried several channels, no interferences, signal is full bars on both machines which are sitting next to each other by the way. So no physical objects blocking the MBs wifi. Also did a clean install on 10.6.8.
Help!?

Thank you for your reply.
I think we have the very same Macbook.
As yours mine is maxed out with 4GB of installed RAM, where 3GB can be addressed. Same specs as you see.
Also I'm not running anything except Finder when testing. Currently there's plenty of RAM free. With Safari, Mail and iTunes open I still have 800MB free.
I'm going to install Leopard or even Tiger on a spare partition, just for testing..
By the way, did you try Lion? Even in 10.7.4 I had Wifi drops on wakeup plus the same slow file copying speeds..

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>
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