Safari 5.1 Slow Web Page Delivery

I'm seeking some help with very slow web page delivery on my mid-2010 iMac i3 with 12 GB of memory. Here's the facts:
Using Safai 5.1 with OSX Lion (7.1)
Very slow web page performance whether I use my wireless network or an ethernet cable connection (with wireless disabled). Both are slow.
A Windows computer in the same room, on the same wireless network, delivers pages briskly (with IE or Chrome). The problem does not seem to be related to the ISP (Comcast).
FTP on the Mac is quick, problem seems to be isolated to HTTP.
I upgraded from Snow Leopard a week or so ago but even with Snow Leopard the web page delivery was slow. Lion seems to be even slower.
For example, "Toms Hardware" just took about 2 minutes to fully load.
Very frequently, a web page will stall (blue progress bar doesn't move). Reloading with Command + R often helps but not always.
I tried to Empty Cache without a better result.
At this point, Safari is almost unusable because of the speed issue. Please advise with any suggestions. Thanks.

I upgraded from Snow Leopard a week or so ago but even with Snow Leopard the web page delivery was slow. Lion seems to be even slower.
How much free space on the startup disk?
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure you have a minimum of 15% free disk space.
If disk space is not an issue, try Safari in another user account. Pages load slow there, log back into your admin account, launch Disk Utility. /Applications/Utilities
Select MacintoshHD in the panel on the left then select the FirstAid tab.
Click: Verify Disk (not Verify Disk Permissions)
If the startup disk needs repairing, follow the instructions for Using Disk Utility to verify or repair disks

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