Same problem (and more). Worked fine yesterday. Today? Unplayable:
2019 iMac OS 10.14.6
Retina 5K, 27"
3.7 GHz Intel Core i5
Graphics: Radeon Pro 580X, 8GB
Running client in windowed mode 3200x1800
Mac is set to default display setting
When alt-tabbing, the client is unresponsive for about 5 seconds. Then the window goes blank (except it’s entirely BLUE) before graphics return and are interactive.
Extreme retardation of input results.
Warping/Gate use stops & starts several times, graphics freezing
At times, the client freezes completely for between a couple of seconds to almost a minute, at which time, the game seems to “catch up” like a very fast time lapse before bogging down again and repeating the same behavior.
I can forward log files if you’d like.