Parts stay in time on a slow device
When a guitar or bass part's notes are ready late, on a slow phone or right after you click a bar, the part now comes in on the beat instead of trailing the drums and the click.
The player makes the guitar and bass parts' sound a few seconds ahead of time, while the score plays. On a fast computer this is always done well before the notes are needed. On a slow phone, or right after you click a bar to jump there, a part's next few notes could be ready a moment too late.
Before, those notes were played as soon as they were ready, so for up to three seconds the part trailed behind the drums and the click by however late it was. Now the part comes in exactly where the song is: you may miss the first instant of a note, but the part is on the beat.
A loop left running for a long practice session also uses a little less memory now.