Mac speed issues: Here are tips to fix them

Your Mac is unusually slow and you want to know why. Perhaps it started to become sluggish when you installed macOS Mojave, or it could be because you’re running out of disk space. Let us help you troubleshoot the issue — just follow these tips.
Clean up your Login Items
The Login Items list (or “Startup List”) contains all the apps and programs that automatically start when you log in.