Painter 2020 iMac 5K 2017

Hello. I downloaded Painter 2020 for trial. I'd like to give my specs the end of my message  for the issue I'm dealing with. It seems like Painter doesn't have a support for some iMac 5K retina models. Or maybe it doesn't support graphic card yet. Software runs very slow when you launch it. Moving a page, rotating it, any brush stroke takes ages. It's so laggy and slow impossible to use. It's obvious something wrong with it. When you run the software in Low Resolution Mode it runs faster as it should be. Low Resolution mode is non Retina display mode. So either your software doesn't support retina algorithm or graphic card or everything related to hardware itself. Any plans to fix this issue soon? 

iMac Retina 5K, 27-inch, 2017

Processor: 3,4 Ghz Quad-Core Intel Core i5

Memory: 16GB 2400 mhz DDR

Graphic Card: Radeon Pro 570 4gb