How does Evernote save notes?

I use Google Keep for most of my notes, but I’m migrating over to Evernote. One of the things that I know is a problem with Google Keep is that sometimes, when you’re pasting notes, you’ll have to wait for Google Keep to save the notes before you close the tab. If you try to close the tab before it’s done saving, you get a warning and you can abort the closing of the tab, let it wait a few more seconds, then close the tab without a problem.

I didn’t experience that so far with Evernote. How do they save their notes? If I paste something into a new note, will it be saved immediately? Can I close the window without worry and it just continues in the background?