I thought it might help to demonstrate the issues I’m talking about, so I made a quick screen capture comparing the described behavior on both WL 10.0.30 and 9.5.5. It was done on my MBP, unfortunately not in the studio but on the couch at home right now, so there’s no external monitor, no dedicated audio interface, etc.:
In the beginning you can see my monity statistics showing how much CPU and RAM was available when I started the test.
Then I’m opening up the system information that shows you the initial use of the Intel Graphics Card.
When opening WL10, it’s loading up a montage with my standard master section plugins, all metering stuff. The effects used on the clip are bypassed. I’m indicating various areas of laggy and slow graphical display with the mouse. When moving the window for the NUGEN VIS-LM you can see that the window is dragging behind the mouse clearly. I’m then opening up the system information page again and you can see the Radeon popped up.
After that, I’m loading a montage with exactly the same settings in 9.5.5 for comparison. Everything is working a lot more easily and fluid.
Buffer in both versions is set to 512.
There’s not much CPU intensive stuff going on in the montages as you can see. As soon as I start to add more effects and processing to clips in the montage, the performance goes worse and worse pretty fast. WL9 doesn’t show this behavior at all, it’s very efficient and very stable.
I hope that helped to understand what I was talking about. Let me know if I can contribute any more information to help solving this problem. WaveLab is an important part of my professional work and I’d love the new version to work better on macOS.