The time from you enter the URL to you have landed in a usable state where you can use the site. For something you keep open all day, like email, general perfor

The time from you enter the URL to you have landed in a usable state where you can use the site. For something you keep open all day, like email, general performance matters. But for things you use once or twice for 5 minutes, startup time matters a great deal more compared to the former.