One safari is fast but the other one is extremely slow while open the same website!

When i open nrich.maths.org on my two macbook pro, one is fast but the other one is extremely slow. I traced this website on both but seemed nothing difference.
My safaris are both version 5.1.2 (7534.52.7), os are 10.7.2, settings of safaris are same.
I also tried some other sites but all's fast.
Anybody have any ideas?
Appreciate!
Tony

On the one that's slow...
Go to Safari > Preferences - Extensions. If you have any installed, turn that off, quit then relaunch Safari to test.
If it's not an extension issue, try troubleshooting the Safari .plist file.
Go to ~/Library/Preferences. Move the com.apple.Safari.plist file from the Preferences folder to the Desktop. Qui then relaunch Safari to test. If Safari speeds up, move that .plist file to the Trash. If not, move it back to the Preferences folder.
Empty the Safari cache more often. From the Safari menu bar click Safari > Empty Cache
If that doesn't help, back to the menu bar, click Safari > Reset Safari. Select the top 5 buttons, click Reset.
~ (Tilde) character represents the Home folder.
For Lion: To find the Home folder in OS X Lion, open the Finder, hold the Option key, and choose Go > Library

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