@undershift
i dont know whats wrong with your machines but after the efi update and the mavericks update at the latest, my machine is running smoothly. i would nt use usb or firewire audiocards with it, but there are def. no hangs!
one thing you should nt do is using chrome!
efi update ? 10.9.1 ? the one that causes those troubles ??
and i use my mac for word, pwp, music and videos, 2000€ for a non working audiocard / usb device, i def. not agree with you...
Just got Apple France at phone yesterday, the guy told me to clean install without system prefs, wich i did earlier today, and same things happend. Moreover, it happened even if i didnt get my stuff back from time machine. Wich means with a clean OS it's still have trouble...
In no echec mode (dunno in english sry), it's seems that we have way less freez than in normal mode, but *** with a 2000€ hardware...
I never had those kind of issue on macs, and i'm on it since a long time. This no reply, no clue, nothing to do is rly annoying 190 topic's pages and still no informations...
APPLE ARE U HERE ?!