I believe I have a 13" MacBook Pro mid- 2011. Once I upgraded from Maverick to Yosemeti and hated it, went back to the Apple store and had Maverick reloaded. I keep getting alerts to upgrade to High Sierra but I call seeing a post on here that indicated most people didn't like HS - slow loading was one issue. Has that upgrade improved at all or is it still a pita? Just wondering if I should wait until the next big thing come out? Thanks.