I there a shortcut to minimise all the behaviours rather than having to do them one by one?

ETGgames

It gets really laggy when i try to open an actor with lots of behaviours, especially when switching from one computer to another (when you download your game from the site, it maximises all the windows you may have closed in previous versions that you uploaded to the site).

tatiang

Unfortunately, no. But you might want to save the project file in Dropbox if you need to open it on multiple computers.