No more pauses while you edit a long score
The tab editor no longer freezes for a moment after you type, and Save no longer holds the page up, however long the song is.
The tab editor keeps your unsaved work in the browser as you go, so a reload or a crash loses nothing. On a long song, writing that copy held the whole page up for up to half a second, just under a second after each fret you typed. If you were still typing, the keys you pressed had to wait.
That copy is now written a little at a time, between your key presses, so the page stays responsive while you type, click and play. If you change something while it's being written, it starts again with your change.
Save works the same way: the page doesn't stop while the file is being written, and "Saving…" shows straight away.