Hi there, I've looked up my MacBook Pro 15'' Retina's activity log and I mentioned that it was using over 7GB of memory, yet the MacBook itself has 8Gb available. If I may believe activity log, over 4GB of memory was used by apps, 1.5GB was wired memory and the rest was cached. Is 4.5GB of usage normal for a standard Mac OS X Mavericks configuration? As I see right now, Safari takes only 300 Mb and Google Drive uses 'just' 150 Mb of memory. Over 1 GB is used by something called kernel task (don't know what it is). Does anyone know if this normal? Could it eventually slow down your Mac's performance? Thanks!