This is a bug Apple introduced in macOS 26.1. We are currently preparing a hot-fix with a workaround for this issue. A possible other solution is to downgrade to macOS 26.0.1.
Thank you @Arne_Scheffler
Hi,
Cubase 15.0.6 hotfix is out. This issue has been resolved in this hotfix update.
Tested it and it works better now. 
I did a very quick test though and although I thought for a second that MassiveX which I’d had opened randomly was getting jittery, it did not cause any more trouble after opening it a second time (could be an NI issue, not a Steinberg issue).
Will keep an eye on it and update any findings.
I am still experiencing stuttering at times, especially when a plugin window is open, like Arturia “REV INTENSITY” and a channel window. Then when you click the timeline and the channel window gets hidden, the choppiness returns. Video:
Steps to reproduce:
- Open a Plugin UI
- Open Channel window, place next to each other
- Click on the Timeline window (which hides channel window)
So MacOS 26.2 just dropped and it contains virtually no real bugfix at all. That GPU buffer issue is going to plague us for 6 more months isn’t it?
Had the UI freezing and based on reading this thread I disabled GPU Acceleration.
Instantly solved the problem.
MacBook M1 Ultra Tahoe 26.1.
Cubase 12 pro.
Guys, has anyone fixed this issue? I’m facing the same problem. Since updating to the new macOS Tahoe 26.2, my DAW has been lagging like crazy. I’m using a 2020 MacBook Pro (32GB RAM, 2TB SSD, 8GB graphics). I’m stuck in the middle of a project and really need help 
i am using CUBASE 14 PRO
Thank you it worked for me cubase 14pro
I’ve had the same issue and in the 2 min of testing this worked for me as well. the different windows and stuff did nothing and I have no hidden windows behind anything. although I am using 3 screens so a lot of windows IN view.
Quick update:
Mac OS Tahoe 26.3 does not seem to fix the issue.
Here’s one thing I’ve noticed that I haven’t seen mentioned here, but I don’t know if it means anything. No stuttering for me on Cubase 14.0.41, until I recently updated Tahoe (I think to 26.2). So I upgraded to Cubase 15.0.10 - problem still exists. I upgraded to Tahoe 26.3 - problem still exists. I’m playing around with a simple project - an audio file (reference), a few Kontakt 8 instances and an Opus instance. What I’ve noticed is no stuttering when playing the audio file by itself, or the audio file plus the Opus instance. The stuttering begins once I unmute a Kontakt instance. Mute the Kontakt instance and the stuttering stops. Should be no hardware issues - Mac Studio M4 Max 128GB memory, three monitors (one 5K ultra wide 60 Hz and two older HDs 144Hz). I’ve enabled and disabled GPU acceleration - no difference.
Thanks a lot, worked for me in Cubase Pro 13 after a recent Mac update.
Przemyslaw what was the Mac update? And what Mac system do you use?
GPU issue still persists in 26.3.1 on both my M4 Max and M1 Ultra Machine
Disappointing but thanks for confirming 
I pretty much have the same set up as you. I have a Mac Studio M4 Max with 128 gb ram. I have 3 monitors. Two are mirroring each other.
I don’t have any kontakt plugins running. I notice the stutters more when opening my kirtchoff eq or Waves F6 eq. Also more often while i’m tracking than when i’m mixing.
I tried disabling GPU acceleration and everything does seem to run smoother but i get these funny choppy looking images and sometimes whole pannels like history and visibility disappear.
Sometimes I even click on an audio clip and hit “delete” to delete it and the clip doesn’t disapper until about a second later.
I have no windows in the background.
I already have a shortcut to close all plugins which i use often and that doesn’t help either.
It doesn’t help that i’m new to Mac either. After 20+ years of running Cubase on Windows 
. If you figure it out, let me know and i’ll do the same!
yeah the GPU disable is just a quick temporary fix. it also doesn’t help on projects with more DSP usage because it puts all the graphical load on the other CPU cores.
I reallllly hope apple is going to fix this issue in the near future. so far, every single incremental update to Tahoe 26 has been a disappointment to say the least.
Sucks for new mac users as their machines come with Tahoe out of the box in most cases.
Also I should have known better. Don’t update the OS immediately when a major update is out 
Sonoma was running so great, so I thought “oh it’s gonna be fine probably” … little did I know.
Coming from a Mac user of 20 years
The new MacOS update to 26.4 does not fix the GPU issue either.
I would like to point everyone to this page:
It lets you write a quick complaint to Apple about this.
Maybe if there are enough messages about the GPU/UI glitch, Apple will notice?
Thanks for the update again.
So 5 months after Tahoe and Cubase 15 were released we still can’t use the latest Mac OS with the latest Cubase properly.
Tahoe 26.0.1 was fine. I tested it lots before switching over. It was 26.1 that broke things.
Steinberg are aware..
The workarounds don’t really work. So I reverted to Sequoia and Cubase 13 while I wait. However I’d like to buy a new laptop as I’m only on an M1 but not until this Tahoe / Cubase thing is sorted.