More on WPMU Performance
Well, my last set of attempts didn’t solve our problems, so I’m taking more drastic measures. One step is to rename the following files (I like to append .turned_off to the filenames):
The theory is that spam bots and other auto-posting scripts are hammering these and bringing up the load. I didn’t check the logs to validate this theory, but it is something that I had done on our previous installation so there’s no harm in doing it again. We’re using WPMU more like a CMS and less like a blogging platform, and we don’t even have support for the display of comments in our theme — no need to leave the supporting files accessible.
The other major thing I’m trying is WP Super Cache. The only problem I found was that updates to the widgets did not clear the cache. Since a large part of the way we let teachers customize their pages is via widgets, this would obviously not work. I did some digging and found a solution and posted about it on the WordPress MU forums.
My next step is going to be investigating the Amazon S3 plugin to see if I can generalize it such that we can store some of our files on another server. (For us, this is more related to upload disk space than server load.)