With the new MacOS 11.4 update, we have discovered an issue with slow start times when launching MATLAB from the Dock or Finder. To workaround this issue as we work toward a solution, you may start MATLAB through the terminal.
To open MATLAB from the terminal, open a Terminal window (/Applications/Utilities/Terminal.app) and run the following command:
Where $MATLAB is the path to your MATLAB directory. For example, if you are using MATLAB R2021a and have installed MATLAB in the default directory, the command will be: