Using a 128 GB SSD MacBook Pro Retina Mid 2014.... Cold Boot up... Public Beta #2 for me was about 12 seconds. Public Beta # 3 now 9 seconds. Timed twice. Safari is a bit faster as well. Overall, pleased with this OS over Mavericks: On my Hdd spinner (2011 MacMini), boot up time with Maverick was 46 seconds or so. With PB 2 it was 32/38 seconds, now with PB # 3, it's between 34/36 seconds. What are you guys seeing ??