Lightroom Classic doesn't work on Mac Book Pro

Hello,

my Lightroom Classic doesn't work on my new MAC Book Pro.

both have the lates updates.

specs of the mac book:

Intel® Core™ i7-8750H Prozessor (9M Cache, bis zu 4.1 GHz)

 AMD Radeon Pro 560X 4GB

16 GB DDR4 - 2400 MHz

the problem is when I'm using Lightroom and edit a photo for example and the more steps i do for example adjustmentbrush and automask and so on, the worse it get's - the mac ball (the little beachvolleyball, when loading) apears all the time. It makes it impossible to work like that.

Adobe already advised: i should create a new user (account) on my mac - but unfortunately it didn't help.

I've already tried almost every  tip and trick to make lightroom faster: increasing the cache etc. but nothing was better.

i don't know what to do anymore, can somone help me?

Thank you!

BR Stipe