Hello my fellow mac people!

Hello! I’m experiencing a massive trouble with performance playing Divinity - Original Sin 2 - Definitive Edition on my new MacBook Pro 2019 16 i7 2.6/16/512 SSD SG MVVJ2RU/A.
although i think it’s configuration should be well for the game. And at the beginning it was perfect - the game set ULTRA quality as the default. But, right after leaving Fort Joy i can’t spend more than 1 minute in game - than it’s starts showing extremely slow performance and fps, even if i set everything to VERY LOW. Is there any solution for this problem? Or this Macbook 2019 is not too strong for Divinity OS ?
Macbook specs:

Intel Core i7 9750H 2.6 Hgz, 16Гб, 512GB SSD, Radeon Pro 5300M - 4096mb
Catalina 10.15.4


Please, help!