Sidebar loads very sluggishly - one website!

I visit one website that is a social journal; the vertical sidebar (along the right hand of page) lists topics and logged-in users.
Within the past two days, the information in the sidebar has consistently been loading extremely sluggishly --- very long delay! Proceeding forward or backward through the articles/pages is very time-consuming because of the slow loading.
Interestingly, this sluggishness also occurs similarly with Safari on both my iMac and MacbookAir!
Since I do not see Safari behaving in this manner on other websites, my assumption was that this reflects a problem with the site's server.
But... WRONG!
I go to the same offending website using Firefox... and the site's pages load completely... in just moments! Tested this repeatedly... and not the slightest sign of sluggishness when using Firefox on this site!
Any advice on how to correct this problem?
I have considered going to "Reset Safari"... but I find the vast number of choices of what to reset quite intimidating.
Is there another route?

Further update to this problem:
I booted from a 3-week-old SuperDuper backup that contains the same version of Safari (5.0.5).
Checking the offending web site... I find no sluggishness in loading! Great!
Repeatedly ran a number of page reloads... found no hint of sluggishness!
OK!
I reboot from MacHD... and, to my utter surprise... the loading problem is gone here as well!!!
So... What happened?
Did the act of booting from a backup... then going back to MacHD repair something?
I haven't the foggiest!

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Host Name: ???
Date/Time: 2006-08-16 18:20:51.014 -0400
OS Version: 10.4.7 (Build 8J2135)
Report Version: 4
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Path: /Applications/Automator.app/Contents/MacOS/Automator
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Images (20 files) 143 KB
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Style Sheets (2 files) 6 KB (30 KB uncompressed)
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