Hello, I have a MacBook Air "13" from 2015 (128GBSSD 8GB Ram 1.6 i5 processor). Right now it's running the latest version of macOS Sierra and it runs smoothly. Should I upgrade to High Sierra? Would the performance be the same, or maybe even better in some areas, or would it be a risk to upgrade? I've heard different reports from different people... some say that it becomes really slow so I am not sure wether to update or not... Any help would be be appreciated!