Webpages loading slow on a wired connection

I have a Mac Pro (2.66GHz Dual-Core Intel Xeon - 1GB RAM) whose 250GB hd has 167GB of free space. Running Leopard 10.5.2. - this is through a wired connection.
Webpages have been running slow before the 10.5.2 update but I finally would enjoy doing something about it. I have a Qwest 1.5Mbs connection that runs through a Linksys WRT54G router.
As an example, when I load cnn.com on Firefox it took 22 seconds to load. Safari took 25 seconds. On Opera it took 25 seconds. I rarely use Opera, seldom use Safari, I mainly use Firefox which is running 8 extensions. On my wired PC (Pentium 4 3.00GHz w/ 1GB Ram running xp) it took 4 seconds to load cnn.com on Firefox that has over 23 extensions.

Yogatoday.com offers online classes. When I open it on any of the 3 browsers on the Mac Pro the video will freeze and sometimes get going again. Sometimes it will stop and never start again. On the PC it works flawlessly.

When I do speed test at speedtest.net the download speeds are the same around 910kb/s and the upload speeds are around 225kps on the Mac. On the PC download speed is the same and the upload speed is 316.


Any suggestions on how to increase the speed would be appreciated.

 

Thank you Amdahl. I will do both tonight and will update you later.