I've been messing about with PSP today. It turns out it is quite a bit quicker on linux.
On a 3570k@4GHz...
Windows 7: 13.6ms per bit using 64bit llr
Ubuntu 12.04 under vmware: 9.2ms per bit
I couldn't remember before what errors i was getting under linux, anyway I tried it now and I get pushd & popd not found, this is after I do the command: sh 4-quad-start-prpclient.sh ... did you ever get that?