Tools for UR 242 - Big Sur on Mac Prblems

Unfortunately I have a big problem with the current tools for UR 242 on Big Sur.

As soon as I install the tools for UR 242 Cubase becomes extremely slow - especially adding and removing plugins and new tracks is excruciatingly slow (between 5 - 20 seconds per step). And of course the beach ball appears permanently.

If I uninstall the tools everything works as it should!

But then of course there are some other problems with my interface.

My system:
iMac Retina 3.5GHz quad-core Intel Core i5, 32GB memory
Mac OS X Big Sur 11.6.5
Steinberg UR 242

Cubase 11 Pro with Absolute Collection 4

Libraries are stored on an external SSD drive.

I have installed all current drivers and updates. Software, libraries and system are up-to-date.