High processor load slows down wireless connection

My wireless connection slows to a crawl when the CPU is being utilized more than 80% (average for both CPU cores).
For example, if I have Safari and Quicktime open, web pages load very fast and the CPU load is less than 5%. When encoding a video in Quicktime, the processor load is around 85%, but web pages load very slowly in Safari (or any other browser). Ping times also increase considerably (from 25ms under low CPU load to 200-2000ms under heavy CPU load). As soon as the video is done encoding and the CPU load drops back down, web pages load fast again.
This problems only seems to apply to AirPort connections. High CPU load does not appear to affect speeds when connected via Ethernet.
Has anyone else experienced this?
MacBook Pro 15" 2.33GHz/2GB/160GB/256MB Mac OS X (10.4.9)

Has no one else experienced this? I can reproduce this problem consistently. Anything that utilizes the processor at least 40% slows down my wireless internet connection.

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High processor load slows down wireless connection

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