Luckily, it is really easy to uncheck this option, in case you are able to access Skype from the Dock on your Mac. In case you are noticing slowdown or drop in performance of your Mac after installing Skype, it is likely that “Open at Login” option is checked for the Skype App on your Mac. Stop Skype From Starting Automatically on Mac Since, Skype is known to be a resource intensive App, allowing Skype to start automatically with Mac and continue to run in the background can impact the performance of your Mac.Īlso, if you are only using Skype once in a while, there is no real benefit in allowing Skype to start automatically on your Mac and continue running in the background.