I know it’s been a while but…
I’m having same issue at the moment and if there’s a solution – I’d like to hear it too.
Working on (or trying, these hangs can take almost half an hour to go away) late2013 iMac 3.5 GHz gtx775 32GB ram, OSX 10.8 and PP cs6.
prproj file is almost 1,5 GB, so it’s quite large project.
Upgrade isn’t a solution, can’t upgrade OSX at the moment so no PremierePro CC.
Matti