January - last edited February
Since the 16 January patch my game has caused my Mac performance to drop significantly while it is running. Attempting to load any other apps or even just clicking on the Apple in the menu bar causes a delayed reaction, as if my Mac is struggling to keep up with the commands. This is especially bad when I am zoomed in on the game screen.
I've narrowed down the severe system lag to only when the game is minimised in the Dock. If the game is running in windowed mode in the background I can happily have loads of apps open and the OS manages resources as expected - smoothly and seamlessly. Once the game is minimised it affects everything else running including other minimised windows.
I have tested on three Macs:
2017 15" MacBook Pro
3.1 GHz Quad-Core Intel Core i7
16 GB 2133 MHz LPDDR3
AMD Radeon Pro 560 4 GB
Intel HD Graphics 630 1536 MB
2019 27" 5k iMac
3.6 GHz 8-Core Intel Core i9
32 GB 2667 MHz DDR4
AMD Radeon Pro 580X 8 GB
Mid 2012 15" MacBook Pro
2.6 GHz Quad-Core Intel Core i7
16 GB 1600 MHz DDR3
NVIDIA GeForce GT 650M 1GB
Intel HD 4000 1536 MB
480 GB SSD
And running the following versions of macOS either internally or on external bootable drives:
macOS 10.15.3 beta build (19D75a)
It happens on both Macs with AMD GPUs but not on the Mac with NVIDIA. It happens with CC and with a clean game folder. Also in a new clean install.
There are also annoying lines across objects in-game in full sunlight. These are worse on the Macs with AMD than the one with NVIDIA. These two issues seem to be interconnected but I couldn't say for definite.