OK 20 minutes is an exaggeration , but it takes my MBP 15" mid-2011 model (MacBookPro8,2) a few minutes to boot up from scratch/off, easily as long or longer than my win7 machines. Seems each month its getting slower. I have OS X Lion 10.7.4, only run ClamXaV on demand, run Onyx maintenance scripts every 2-3 weeks (deletes temp files, caches, rebuilds permissions, et al)... still sloooow to boot. Shutting down seems to take longer too. I regularly update my software. Anything I can do to get this baby snapping back on like it did the first few weeks of ownership? Tx for the suggestions.