I have been having the lagging UI isssue on Tahoe as well. Both Cubase 14 and now 15. Launching Mission Control seems to make it return to normal.
Also shutting off GPU acceleration in prefs seemed to help on Cubase 15. On 14 it helped but surfaced other problems.
I will say that I have not yet tested extensively so YMMV, but may be worth a shot while we wait on a fix.
from Gemini AI: The most effective temporary fix involves altering Cubase’s graphics rendering settings.
Can confirm that disabling GPU acceleration in cleared this up for me in 13 Pro. Thanks!!!
FYI On a Studio M1 Max, disabling GPU acceleration and restarting Cubase did not fix the lag/hiccup issue. I am on Tahoe 26.2 and the Cubase version is 15.0.06
I have M2 Studio - Tahoe was a disaster with Cubase 15 so I ended up reverting back to Sequoia and I can confirm that is works now as expected in Sequoia. Tahoe is the issue
This is one of the things that has kept me away from the Mac Studio so far. It always seems to be the Max or Ultras that always have random issues. I see it at work all the time too. Our touch screen monitors need software on a Mac to work, so we have a third party that makes it for us. The regular and Pro chips never seem to have any troubles, it’s always the Mac Studios or MacBooks with the higher end Max/Ultra multi-processors.
I’ve seen it just with regular old desktop monitors too. Always smooth sailing when its a ‘regular’ Mac but all the problem tickets I have to deal with at work are almost always Max or Ultra’s and unfortunately I can’t convince them to buy me one. Thankfully my boss a few months back was able to get me a new base model M4 MBP to go along with our first gen M1 and the aging 2014 Intel I have that’s no longer upgradable.
Since 15 came out, I honestly haven’t had much time to play around with it, but I just finished up a couple mixes for a project throughout December and it just felt like I was working in 11/12/13/etc as usual.
I’m on a bog standard M1. Disabling GPU acceleration worked with Cubase 13/14 on Tahoe but Cubase 15 had additional graphical corruption.
I waited to see what happened with Tahoe 26.2 and Cubase 15.0.6 but nothing changed so reverted to Sequoia and everything works as expected.
I actually prefer the UI of Sequoia to Tahoe so I’m happy to sit out this Mac OS version.
Are all those Macs running the same OS? I run a Max processor, and I haven’t ever had any serious issues running Sequoia. As far as I can tell (from reading through all the threads on here), the problem is with Tahoe (compatibility, or bugs–IDK)–not the Mac hardware.
I have a Mac Studio M3 Ultra and I couldn’t be happier. I’ve never experienced any of the issues others have discussed at all. I’ve had 1 Nuendo crash in 2 years I think and I can’t remember what it was. C15 has crashed a couple of times after trying to use the MIDI Device Manager (not MIDI Remote, the actual old-skool Device Manager) to build custom banks for my external synths and use the patch labels in the MIDI track after having to build out multi-channel returns using the VST Rack. But other than that my Ultra experience has been amazing. I have to say, my MBP M3 Max has always been super solid too. Just a wonderful system. The M3 Ultra is a bit absurd in all transparency, but the M3 Max 12p/4e is extremely capable in its own right.
Since I updated to OS 26.2 I upgraded from Cubase 14 Pro to Cubase 15 Pro in the hope that the issue would be resolved, but it’s the same if not worse. Constant lagging, stuttering, and glitches, no matter what I do. It does not affects the sound tho, just the interface, its so bad that I can not adjust anything while the track is playing. I also disabled GPU acceleration, and I’m running it in Rosetta mode.
My config:
MacBook M4 Pro
14-Core CPU
20-Core GPU
48GB Unified Memory
1TB SSD Storage
Honestly, I’d have to go dig through the database and look at all of my tickets for the past 3-4 years, but the types of stuff I’ve seen started long before Sequoia or Tahoe were released.
But then again, you’re talking about troubleshooting over a phone or email. If everything the users say is accurate, they’ve got ‘the same system’ Im always running, yet no problems for me. I’ve seen folks not read a single bit of a user guide and completely miss HOW to install things properly on Macs, I’ve had people with all kinds of random crap attached to their Mac for whatever reason that interferes with other things, apps that modify Finder behavior that mess with things, etc. Not that any software my company makes is perfect, but honestly, there’s only been a handful of times over the years where I’ve actually found something and reported it to our BU/developer team.
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’m experiencing sluggish GUI issues with Wavelab 12 after upgrading to Tahoe on my Mac Studio M1. This is also the case with any other apps that use VSTs. Has anyone fixed this issue?
Any news on that issue? Maybe someone found a solution?
I recently got myself a new MacBook Pro M4, and I can’t even keep several GUIs on the screen without stuttering. Pro-Q 4 in full-screen mode just freezes when any other plugin is open in the background.
I could have as many plugins open as I wanted on my Windows machine, using integrated graphics on two 4K screens simultaneously.
There’re so much praise for the Macs and now I have to close one gui to open another. Pretty hilarious
Why isn’t any admin or any expert responding to this?
WTF is up?! Any news on this buggy bs? Are u guys working on a solution?
Really frustrating… Issues started in September… It’s February! literally losing money 
This isn’t Steinberg’s official support forum and the devs are under no obligation to post here, or let you in on anything going on with Cubase. This is a user forum, we’re LUCKY once in awhile the devs have time to stop and chime in on posts, its not a requirement and if you are waiting around for it to happen, good luck with that.
Steinberg has the right idea and doesnt ever let the public know what they are working on. Unlike Apple for example.. Where’s this magic AI they were supposed to have out over a year ago and now we hear they’re just going to use Gemini to run Siri?
Ok, that’s fair. I honestly thought significant Steinberg issues were indirectly reported/notified to Steinberg devs, considering this is an official Steinberg forum.
I’m an idiot, my apologies!
I will naively continue waiting on forums, support pages, emails, YouTube channels and other social media for an actual solution instead of a ‘workaround’… as it seems to be the ONLY thing I can do. Wish me luck 
So….shouid I still wait?
I have exactly the same error with different wave plugins, plugin alliance etc. the graphic freezes and only if I remove a screen plugin, it works again. Is there any solution so long later?
For me the graphic problems were solved by updating to the latest Tahoe 26.4 update