For the 2015 MBP 15" the discrete AMD GPU issue seems to be fixed with the latest betas. However I'm now seeing the issue with the Integrated Intel GPU after using the AMD GPU and sleeping. I see general UI slowdowns and especially issues with Safari on certain webpages. It becomes unusable. The complete bug report I've just sent:
Sometimes when coming out of sleep the graphics system WHEN USING THE INTEGRATED INTEL IRIS PRO seems to be in some sort of slow state that cuts the performance of Safari in particular, but also animations of the UI in general. It seems to happen when running a graphics intensive app that engages the discrete graphics chip (AMD Radeon R9 M370X), then quit it, then sleep. Coming out of sleep after a while when you go to
http://www.icloud.com with the floating bubbles, everything is slow. It takes multiple seconds to drop down the File or Edit menu in Safari.
Steps: (Doesn’t happen all the time, but fairly frequently)
1. Run a graphics intensive application to engage the discreet AMD GPU.
2. Quit the graphics intensive application to engage the integrated INTEL GPU.
3. Put the computer to sleep
4. Wait for an hour or two
5. Wake the computer
6. Go to
www.icloud.com
7. Notice the bubbles move very slowly, only a couple frames a second.
8. Notice when trying to open the File or Edit menu it takes a couple seconds for them to open.
9. Notice moving between menu items in the File or Edit menu it takes a long time for the highlight to catch up with the mouse point.
Results Expected
Safari should be as fast and responsive as it is after a reboot when running the integrated Intel GPU.
Actual Results
Safari is slow/choppy. Other system UI elements are slow
I previously reported the discrete AMD GPU was slow when coming out of sleep. That issue may have been fixed as I’m not seeing it anymore, but now the integrated Intel GPU is slowing down after sleep. Sierra didn’t have this problem.