TB Harmony 20 brush lag on mac OS Big Sur

Hello!

I recently had Toon Boom Harmony 20 installed on a new Macbook, MacOS Big Sur, version 11.1, but when I started using the brush tool it lags really bad on every stroke I make. I tried out the pen tool to see if it also happened with that, but it works fine as well as every other tool. It seems to only be with the brush.

Has anyone encountered something like this? Is there a way to fix it?

Thank you in advance! Hope this can be resolved!