Hey guys…This is a weird one!
I’ve noticed that drawing PNG graphics is slow on my iMac Pro 5K display, but on my connected Thunderbolt display on the same iMac Pro, it’s fast. I mean I can literally drag the interface between screens and see the speed boost.
If I go to System Preferences - Display Settings - Color - and select the color profile sRGB IEC61966-2.1 for the iMac’s display, it becomes fast. So it seems to be the translation from sRGB to the display’s color space.
Has anyone run into this, and/or found a good way of dealing with it? You can see the example image below. You can see how fast it gets when I switch to an RGB.
See Video here: https://www.dropbox.com/s/eraz4zdgmrens2r/iMac_Pro_RGB_Fix.mp4?dl=0