Slow Data Transfer Speeds Between Macs.

Hello Can anyone please help?
When I transfer data between my MacBook and iMac it is taking ages and never used to be this slow a couple of months ago.
A 1 GB file is taking 2 hours. I am using an Airport Extreme 802.11n router on 5GHZ Wide Channel and when I check my connection using Network Utility it says 270 MBit/s.
Any help would be appreciated
Thanks
Shaun

I am having a very similar issue. I am copying iTunes music to a USB flash drive formatted to FAT32. It is very slow - not as slow as you have indicated, but still very slow. Someone mentioned it could be Spotlight indexing the USB drive. I am going to turn indexing off and try again - although it is taking a long time just to stop the current copy that I had in progress.

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Attachments:
t3 - SCLK setup time.jpg ‏156 KB
Data byte Transfer_109.jpg ‏137 KB

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