This post probably will not considered as reliable info, but 64-bit client on my hackintosh runs worse than 32-bit one. I never had ANY stability problems, maybe one or two game crashes for last year. So far no crashes on new client, but what I can tell for now:
- faster game start, faster game quit (almost instant)
- longer loading time for maps: Lions Arch (Traders Post Waypoint) – 7 seconds for 32-bit client, 11 seconds for 64-bit client with the same graphic options
- shutter while running or moving camera around
- gamma not working at full screen – all is quite dark
It’s unplayable for now, so for me its best to stay on old beta-client.
My machine: Intel i7 4770K 3.5GHz, 256 SSD hard drive, 16GB of RAM DDR3, GeForce GTX950 with 2048 VRAM, El Capitan 10.11.6
Before anyone ask: yes system is stable as hell, no crashes. Ever. Full compatibility with all apps, system functions, Apple devices, HomeKit ecosystem and iPhones and iOS.