Extremely slow file transfer speed

Hello,
Has anyone else had problems transferring files between computers over a 802.11g network? Recently, I found that transferring files via wireless has become incredibly slow. This morning it took about 10 min to transfer a 25MB file from my MacMini to my MacBook Pro. This was not the case several weeks ago.
In terms of updates, neither have the notorious Airport Extreme 2007-001 update installed. Though, I did have to reinstall OS X on the Mini to roll it back. The MacBook Pro does have the Security Update 2007-001 installed where as the Mini does not.
Specs:
Wireless Router: Linksys WRT54GSv4
MacBookPro - 2GHz Core Duo
MacMini - late 2006 - 1.66GHz Core Duo
Thanks

Golybs wrote:
is there a way to find out why "a file is in use" / what process is using it, and kill that process?
Yes. Launch the Terminal utility and enter this command:
sudo lsof | grep "sometext"
That character after "lsof" is a "vertical bar", which should be on the far right of the row with "P". The first character of "lsof" is a lower-case letter "L". The text "sometext" should be replaced with at least part of the name of the file that seems to be locked. The quotes aren't necessary unless there's a space (or one of a few other odd characters) in the text you put in the command. After you type the text, press <return>. You'll be prompted for your administrative password.
If the culprit turns out to be Finder, try clicking on the Finder icon on the Dock while you hold down an "option" key, then choose "Relaunch".
how can I find out if some process is accessing the Time Capsule hard drive, keeping it busy and making the transfers slow?
That's a little harder. You could launch Activity Monitor and click on the "Network" tab in the lower part of the window. I'd also check the quality of the signal to the Time Capsule
If you have an Apple AirPort base station, I'd use the advice in this thread to investigate the signal and noise levels that each Mac sees, as described in this thread:
http://discussions.apple.com/thread.jspa?threadID=2347845&start=1

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