The Recent Links Module has been tried and found guilty of Massive Rebuild Slowdown and has been taken off the website. Commenting and rebuilding is lightning fast now!
So, just so you know!
Don't use the LinksMentioned plugin unless you're prepared to wait an extra two minutes for rebuilds!
Someday I'll figure out a way to get around this. In the meantime, well, you'll have to live without the handy list of mentioned links in the sidebar.
The speed versus usability evaluation says the site should rebuild in less than 60 seconds. Usability, while it was nice, the links are included in the entry bodies, after all.