Quoting from here:
In use, we found editing nodes to be a little sluggish on the app version, but this isn’t a major issue as it’s not something you’ll frequently be doing.
I'm new to SoundID Reference and this has also been my experience. Moving nodes and target range markers is very laggy. I assume there's no quick and easy fix for this but it's something users will complain time and time again until it gets fixed.