Have you looked into compression of the HTTP stream? In the five minutes I've looked, it does not appear that you are using it. Here (http://www.websiteoptimization.com/speed/tweak/compress/) is a quick overview of the tech. A quick search (http://www.google.com/search?q=php+compression&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official) shows that implementing it in PHP is not too hard.

Now, this is only handy if your issue is bandwidth, not CPU time. If your CPU is at 100%, then this might slow things down.

Pat.