I’m running Windows 10 and the lag for the tonecurve (same code as basecurve I think) is near
enough to real time. I’m not running OpenCL and my CPU is a 6 core i7 that is a few years old.
Recently there has been a lot of discussion and work on github of UI speed-ups… so maybe I just got lucky and picked off versions that had benefited. I’ve just built a fresh version tonight and it seems fine…