It's way more than a few seconds if you simply open a Biab song that has all RT's in RB. It can take 10-15 minutes or so and even longer than that if you have a soloist RT. This was the primary reason for developing the D&D function.

Initially, when RB was first created, being able to open a Biab file was a big thing until all the RT's came out. Now it's a complete waste of time. You can cook and eat breakfast while the song is generating if you try that.

RB has many ways to allow you to get your project done like only generating the exact bars you need rather than generating an entire track for example or using the Bars window to move song sections around or to copy entire sections to extend a song.

But trying to use RB as if it's Biab is not very efficient. If it's Biab you need then use Biab not RB.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.