There are multiple possible causes, and we’ll look at how to fix them. Have you noticed that after installing Mojave, the time it takes for your Mac to start up seems to have taken a nosedive? Surprisingly, this isn’t all that unusual and happens to a small percentage of users after a major macOS upgrade. Some of these tips involve removing files or performing actions that can result in data being removed. To cover that possibility, I’ll include a few upgrade tips that can help you get your Mac back into tip-top shape.īefore you start, make sure you have a recent backup. Each new version of the macOS seems to need just a bit more processing, graphics, or disk performance than the last one. Of course, your Mac may just be at its performance limit. If you’re experiencing slow startups after installing macOS Mojave, you may find one of the tips below will get you back up to speed.