So you may be annoyed with the Pure Mode dialog. I’m talking about the dialog you need to click OK on every client launch which restarts the client.
To bypass this, copy your existing FiveM shortcut (or modify your existing shortcut) and paste -pure_1 into the target section after FiveM.exe.
Example:
You should start with Pure Mode already applied and ready after doing that. Be advised that connecting to non Pure Mode servers will require a restart. So you might want to make 2 different shortcuts.