by Joe_H » Tue Oct 20, 2015 9:29 pm
Could be both, not enough information provided to even guess. A lot will depend on how you have configured those two servers, and what number of cores your client is requesting WU's for. If you post the first 100 or so line of the log file, that will give information on configuration and what type of WU's are being requested.

iMac 2.8 i7 12 GB smp8, Mac Pro 2.8 quad 12 GB smp6
MacBook Pro 2.9 i7 8 GB smp3