Gmod crash on start

anyone else having problem when you start up gmod and it freeze in the loading screen, plz help

have you tried not downloading a shitton of addons

or

have you tried to get a better computer

i dont have that many addons and my computer runs gmod perfectly

i may had ask the wrong question, how do you change the resolution without having to be in gmod

Put -l lengthhere -w widthhere in your startup parameters