[foobiekr]

Clearcase performance for many builds was specifically impacted by the very poor performance of stat(). You could make very real improvements on build times by reducing the number of calls to stat(). It was sort of amazing.

Clearcase also suffered, at least in my experience, from a clumsy and ugly merging process and deeply unintuitive command set which meant everyone who "used clearcase" actually tended to use some terrible homegrown wrapper scripts.

Still, considering it was the last remaining vestige of the Apollo Domain OS, not bad.