So I don't know if I did anything or if it's just my MBP. My daily routine of use with this beast is this: Open Firefox- maintain a website. Excel - 2 documents up at a time and Mail app open. That's it. I used to be able to edit excel text quickly, now my mac kind of freezes for 2-3 seconds before saving, changing text etc. This just started like yesterday. I am guess this is because of the new Office update since formulas don't even work for me anymore. Then again other programs are slow as well, so maybe its the system and not the update. Any ideas?