At the request of our webhost we have now installed the caching plugin W3 Total Cache on the Ludum Dare site (I can hear you laughing at us for NOT running one). The process has so far been smooth and painless, but we’ve only been running it for minutes and not days (nor during an event), so we’ll still have to see if there are any issues.
I have avoided cache plugins in the past since there were “promises” of incompatibilities with some of the plugins I was investigating. We never had the time to really determine the issues, but thanks to our outside encouragement, it’s trial by fire time.
So far everything looks to be working fine, but the big test will be Friday night.