I've noticed no lag either. However I see the same black box around the Volume animation popup. I just felt Apple sucked there - a company that I loved for desi

I've noticed no lag either. However I see the same black box around the Volume animation popup. I just felt Apple sucked there - a company that I loved for design and for details making such a mistake? Adding to that, I've owned two Mac's over a period of 3+ years and never once have they crashed. But today Yosemite just shut down all of a sudden. I've lost my confidence on Yosemite.