A slow Mac or one that crashes often can be caused by a variety of issues. One great tool available to help troubleshoot computers is an option called Safe Mode, where you start up your computer in a mode where all startup items are disabled. This can help you narrow down what may be causing the problems on your Mac
I cover how to use Safe Mode and when to use Safe Mode, as well as what Safe Mode is. It is a troubleshooting tool for Mac that I highly recommend you use.
This video is part of a Troubleshooting Guide for Mac, where I cover some of the best tools available on your Mac to help identify any problem.
