when i went to the apple store for a permissions issue, the genius said that they thought that safari was running slow.
she opened up some folder extensions....not too sure how she got to them, but when she did she selected 4 or 5 extensions or filenames or something, dragged them to the trash, emptied it, and then it was like a whole new computer. safari FLEW. i asked what she did and ''it's hard to explain, something i learned from working on these for 15 years''. she wouldn't show me again (they WERE busy....but still, it was incredible)
any ideas folks??