I have a year-and-bit MacBook Pro that's still churning through large RAW files like a champ. I find that HDD I/O is the greatest bottleneck in that use case -

I have a year-and-bit MacBook Pro that's still churning through large RAW files like a champ. I find that HDD I/O is the greatest bottleneck in that use case - are you running a SSD or a hard drive? Bear in mind also that mine is the i7 + maxed out RAM, which helps also.