I bought Imperial Delay when it was last on sale (more than this though!), as I really liked it when I demo'd it, but I never actually use it - it doesn't seem to work as well in the paid-for version (psychological I'm sure).
A track you can listen to and not listen to at the same time...
https://www.bandlab.com/track/49bed329-7ca2-ef11-88cd-6045bd345b20?revId=47bed329-7ca2-ef11-88cd-6045bd345b20
Less scientific but with my old MOTU Ultralite III, ASIO, I can run Sonar at 64 samples buffer with a reasomable project, but CbB drops out on the same project almost immediately.