Report Generator for Squid log files

what is the best report generator for squid proxy log files? I have tried SARG and it works good, only problem is on one computer it takes way to long to process a 3-4M file with the CPU maxed. I have also tried webalizer and I really like those reports, only they don't give me the breakdown for individual users (authenticated).

So does anybody have a better suggestion, or a custom report thru webalizer, or help getting SARG to not choke my machine

TIA

whats problem
sarg can run at night

or renice the process :)))