It was debug builds, which put an additional strain on the linker in that they keep around all the debug symbols.  Regular builds were slow but manageable, so it&#x27;s not like we couldn&#x27;t release or develop, but it meant tracking down any sort of crash or serious bug became very difficult until we got the dependencies under control.<p>I forget the exact compiler settings - wasn&#x27;t my department - but I think it included link-time optimization, and also FDO.