MacOS 26 Known Issues:

[MysticalOS-2510525]

Massive Performance issue longer wow remains open:

New mac specific performance issue affecting macOS 26

There exists a new issue causing performance degradation over time that’s relatively new to client. talking last 1-2 weeks not patch 11.2 itself. So likely a hotfix patch that broke things. Below are key things I noticed: It seems to be mac only (possibly even macOS 26 only or at least way worse on 26) It seems to build up over time so a fresh launch of game resolves/has no issue. The issue is caused by non modifier input (so any input that triggers an action but not keys like shift command o…

Liquid Glass border doesn’t disappear on full screen mode:

Tahoe 26 added a border to my borderless window?

I just upgraded to Tahoe 26, but it appears that now my game has a semi-transparent 1 pixel border around its edge at all times, which is very distracting. If this is something that can be adjusted on Blizzard’s side (during window creation, say), it’d be much appreciated. It looks like Moonlight is affected by it too, bummer: https://github.com/moonlight-stream/moonlight-qt/issues/1661

[Boland-khazgoroth (Boland)]

You can add ‘broken VRR support on Intel Macs’. 2019 MacBook Pro with eGPU (6600xt) and 165hz external monitor using DisplayPort. Flashing black frames/out of sync presentation etc. Terrible. Absolutely perfect on Sequoia, completely broken on Tahoe. No difference with HW cursor on/off etc. Reproducible on other Metal games (the witness).

[MysticalOS-2510525]

I been telling users on non apple silicon macs to avoid os updates for a while now. each upgrade has only BROKEN things on intel macs and that’s it.

MacOS 14 broke drivers for intel integraded gpus
macOS 15 broke drivers for AMD gpus using Metal 2
macOS 26 broke drivers for AMD gpus using Metal 3

this means if you are on intel integraded gpu last stable macOS is macOS 13, metal 2 amd card should be on macOS 14, and your last stable OS is macOS 15

btw apple hasn’t added any fixes or enhancements to intel macs since macOS 13 at best. beyond that they ONLY care about apple silicon which is why they don’t notice or care each release after it has further broken intel macs. I would not count on your issue being fixed either as they have shown us that they’re not gonna fix issues even if blizzard reports them directly. I remember fiasco blizzard had with macOS 14 breaking intel IGPU drivers and despite outcry apple never cared to fix it. To this day those users still blame blizzard for it too cause they didn’t understand the real issue was apple saying “buy an apple silicon mac or else”

[Boland-khazgoroth (Boland)]

Yeah, rolling back to Sequoia. It’s a shame, as other parts of 26 are excellent. But gaming isn’t one of them on the last batch of Intel Macs.