Speed up Internet Explorer 6 Favorites

For some reason, the Favorites menu in IE 6 seems to slow down dramatically sometimes--

I've noticed this happens when you install Tweak UI 1.33, for example, and when you use the preview tip to speed up the Start menu. But here's a fix for the problem that does work, though it's unclear why: 

Just open a command line window (Start button -> Run -> cmd) and type sfc, then hit ENTER. 

This command line runs the System File Checker, which performs a number of services, all of which are completely unrelated to IE 6. 

But there you go: It works.