This aspect of Safari 5.1 is really lame!
"Webpages are not responding. To visit the selected webpage, all webpages in other tabs and windows must be force reloaded. Do you want to visit this page?"
Maybe I have something misconfigured but I think I am going to be forced to revert to the last version of Safari. An error window with the above text is popping up too frequently and my general overall impression of new Safari is that it is weak. I am for the first time actually seriously considering installing Chrome to overcome issues of slowness with this latest version of Safari.
Just to note: This force reloading issue is particularly troubling when I have a paused YouTube video in another background window that is forced to reload. When it reloads that paused video starts over from the beginning and immediately begins to play.
-Scott
MacBook, Mac OS X (10.6.8), 2009 Aluminum Macbook, 2 GB Ram