Why is browser performance so bad on my new iMac?

I'm using the latest generation iMac 27 inch with the dual 3.2ghz i5 processors, 8GB of memory, and 1TB HD. Over the past few days I've noticed the page rendering speed of this iMac using Safari has gotten embarassingly bad. I haven't seen problems like this since I was on dialup AOL on my original 7500/100 in 1997. Honestly, my iPhone 4 displays pages incredibly fast just using 3G, so this is really disappointing for a $2k+ computer.
I enabled the Dev menu and emptied the "caches" (not sure why there was a need for a plural there...), and the performance got worse. I've also tried Opera, OmniWeb, Firefox, Camino, and even Sea Monkey. All of them are affected to some degree. Some put the text up fairly fast, and then spend quite a bit of time loading images, with or without placeholders. Some just sit on a blank page and do nothing for several minutes. I've had quite a few default to the old Lynx-style text pages, like I had followed an old Tripod page link and then backed my way up the link into the owner's user directory.
I thought that my local net connection may have been a problem, since it was delivering about half its rated speed just a few days ago. However, I loaded up both the DSLReports and Speedtest sites and found that my connection was at a strong 10mb/sec rate. Interestingly, those two sites loaded fairly quickly.
This is happening globally, across a wide range of both Webkit and KHTML browsers. Is there a pref somewhere that needs to be adjusted?
Such an awesome machine, otherwise...

I was amazed at the amount of info you put into that post. Thanks for that effort.
I made sure Onyx was up-to-date and ran all the schemes you listed. That did nothing. However, reading further in your support thread gave me some ideas. I started looking into third party extensions and plugins. I recalled installing Silverlight a few days ago, for what reason I have no idea, since I trust Microsoft only marginally more than I trust Google. Which is to say, I don't trust either of them at all. So I threw that plugin into the trash.
I should have checked the performance right there, but I didn't. Right under Silverlight, you mentioned Flash. I decided to check the prefs on it, and found that it was set to allow sites to save info to my computer, and Camera/Mic and Playback were changed from "Block" to "Ask Me". I distinctly remember setting those for maximum privacy. I reset them, cleared all the files, and exited the prefs.
I just checked them again, and everything is changed back to allow Flash to have its way. Looks like I'll be uninstalling that now...
I also installed Acrobat recently, just to have an alternative to Preview. Sea Monkey opened an alert box just now, telling me to watch out for the Acrobat plugins, as they've been known to cause problems. Gotta love Adobe.
Back to the topic at hand, I think it was the Silverlight plugin that caused the slowdown. All my browsers are running at full speed now after I threw that plugin out. (Now if I could just get Safari to allow me to back up a page without re-rendering it every time...)
Thanks very much for the help.

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