My wife is a professor at Rider University and uses Rider's Zimbra webmail for work. About 3 weeks ago she began to suffer from severe time-lags on every page starting from the login. I called Rider IT support and they suggested cleaning her Firefox cache and using basic HTML and losing styles. None of the suggestions worked. Neither the 2 iMac's or her MBPro can connect wirelessly from home. Outside the house, her MBPro has no problem.

I then tried having her Macbook Pro connect directly with ethernet instead of the Time Machine/wireless we use every day without problem. Guess what - no problems! Her browsers (Safari and Firefox) have no problems with any other websites when connected wirelessly.

Any ideas what might be causing the problem?

Thanks in advance for the suggestions.