Everything from slow speed, erratic mouse behavior, text dropping off from keyed entries to slow wifi speeds have occurred since updating to Mojave. How long will Apple be supporting High Sierra? I'm thinking of retrofitting to High Sierra. Has anyone ever gone back to an earlier OS until the current bugs are eradicated and how much effort was it? Been with Mac since Lion, and this is the worst upgrade I have experienced even with a 2017 MacBook Pro with 16G ram.