Hello, I want to share my experience. It seems that the problem is in QuickTime and only with .mov footage. Everything was fine at the beginning, except I got Quick Time server error exiting Premiere. One day after reboot (nothing was changed or installed!) Premiere started to work really slowly and there was no QuickTime server error anymore.
CC 2014 has build in QuickTime codec. In CC you had to buy QuickTime Pro. May be installing fresh Windows with no QuickTime PRO driver could fix the problem, but I do not have time to try this.