Soon after I upgraded to 1.5.1 yesterday, I installed Donncha's Sp Super Cache. All went well and it seemed to be caching lots of pages.
Alas, when I woke up today and tried to open any blog at http://blogpeoria.com, all I got was a white screen and a lovely message at the bottom of my browser saying "waiting.:
I could access my admin pages, which loaded immediately.
So, I did what any WPMu user ought to do in this situation: I dumped the last plugin that was uploaded to mu-plugins.
My blogs started loading like normal.
Darn it.
I really need a solution for the server load issues that my host is complaining about.