Painter 2020 + Cintiq pro 24 4k

Hello Everyone! 

I am facing a trouble here using painter 2020 demo .

Maybe is something related to win10 or 4k issue ?

Test 1 ( with painter 2020) :

Open painter, do the Painter brush accelerator, machine is good. Do all my painter settings the way i like it.

- Open a big canvas 11000 x 11000 pixels - 150DPI

- Select the pencil 2b size 20

***Final effect Very slow and big lag to paint, impossible to work/paint.***

Test 2 ( with painter 2018):

Open painter.  Do all my painter settings the way i like it. ( same from 2020 ) 

- Open a big canvas 11000 x 11000 pixels - 150DPI

- Select the pencil 2b size 20

***Final effect , Ultra fast/smooth , no lags,  the program is running fantastically .

I have no idea what happens and why the painter 2020 is running slowly ( same thing with paint 2019) 

That's why i don't update yet to the newest version.

It's  the same machine, same resolution .

But, for some reason Painter 2019/2020  are not working as good Painter 2018.

Machine settings:

Xeon 6-cores 2186m

Quadro P5200

32gb ram ecc

Maybe i need to adjust some setting?

I already enable/disable GPU performance, change cores used from processor and more.

Maybe need to sticky a little more with Painter 2018?  Any help will be awesome

Thanks in advance.