I have also the same issue. When the project is bigger than a certain threshold, it turns very sluggish, just like OP writes. Also my CPU load is very low during playback. I am using the v6.33 on Windows.
But: When I stop, one core is running at 100% and the rest are not. To get this effect, I have set the "Do not allow the OS to relocate worker threads to different CPUs" in the preferences.
I have the feeling that the size of the VST parameters is playing a role here. The project gets much more responsive, if I delete those VSTs that use a lot of space to store the status.
On the other hand, it could also be the total size of the project. If the project is 500k it is much more sluggish than if it is 350k.
If it is less than 100k, everything is without any delay.
Automation points do not seem to be important for the issue I am seeing, except possibly for increasing the size of the project.
Perhaps there is some sorting being done when pressing stop or solo or any of the other commands that cause these delays?
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