I did it. I just went and ordered a better server for TFL. It'll be a major step up in every way: twice the RAM, 5 or 6 times the CPU, faster hard drives. It should considerably reduce the double posts and number of times when TFL feels slow.
As well as the move to the new machine, it'll also be an upgrade of OS, database, web server, and content management system. I hope all of these changes will result in improvements for the user experience here, but inevitably there will be some hiccups, new tricks to learn, and new bugs to fix.