Keep in mind there normally won't be a Beta 2 until January.
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
macOS Tahoe 26.3 Beta 1 - Bug fixes, changes, and more
- Thread starter WilliApple
- WikiPost WikiPost
- Start date
- Sort by reaction score
- Status
Keep in mind there normally won't be a Beta 2 until January.
This has been a significant nuisance from 26.1 (or even from 26.0.1). There are disproportionately long 100% CPU periods after which it manages to calm down. I have no complicated automations or Shortcuts either - but it looks like this process is related to periodic background tasks. Still it does not look normal.
This is, frankly, insane. The processors in any Apple Silicon machine are far, far more powerful than simply being able to deliver some fancy graphics. It can run AAA games ffs. There's something fundamental underpinning this, and it's not just about optimisation. If Apple are committing code this bad, then something has gone badly wrong somewhere.
What a crappy OS. They replaced the Launchpad with the Apps menu. Fine. But now it is glitchy and results in a modal windows which cannot even be dismissed / closed without restarting the Dock?
What is this, an alpha build of macOS?
What is this, an alpha build of macOS?
I'm convinced an increasing number of the people developing at Apple don't even use the OS.
Spotlight works fine. I can open spotlight over the window when it happens.
Killing the Dock restores functionality.
Yes. These little transparencies and effects should be NOTHING, NOTHING, for a modern GPU, even a mobile one for phones. And honestly there's not much liquid glass in Mac anyway. We should not be seeing CPU GPU sustained spikes due to the UI
Hope I don't jinx it by saying this now but holy cow, current beta is the most stable Safari I've seen in past 2 years!!! I'm not getting websites constantly crashed as well as Safari itself crashed every time I closed a tab. Please don't f*ked this up again Apple...
Memory usage got back to normal now after several reboots an logouts. At first it even got worse, up to 56 of 64GB used when only the browser had been open, what was using 3-6 GB.
Memory usage went over 90% before now it's between 25 and 30% when doing almost nothing or watching videos on YouTube.
But GPU utilization still is very bad, it does look like this for example when absolutely nothing is going on, no browser running, only a few menu bar apps like this one:
In previous versions of 26.x it was jumping from 0% to about 25% all the time.
Now it looks like the average is more than 30% and the minimum about 20%, it never goes back to 0% again.
While this screen recording it even once jumped to 51%.
It's a 20 core GPU in this M4 Pro.
The whole thing including CPU looks like that. This time with this tab open and several inactive YouTube tabs in the background. GPU usage is about the same than with even no app running at all, very strange.
Memory usage went over 90% before now it's between 25 and 30% when doing almost nothing or watching videos on YouTube.
But GPU utilization still is very bad, it does look like this for example when absolutely nothing is going on, no browser running, only a few menu bar apps like this one:
In previous versions of 26.x it was jumping from 0% to about 25% all the time.
Now it looks like the average is more than 30% and the minimum about 20%, it never goes back to 0% again.
While this screen recording it even once jumped to 51%.
It's a 20 core GPU in this M4 Pro.
The whole thing including CPU looks like that. This time with this tab open and several inactive YouTube tabs in the background. GPU usage is about the same than with even no app running at all, very strange.
I thought I was the only one, but I'm having this issue, too.
sudo killall Dock and then restart Finder generally "fixes" this for me (until it happens again).
I just forced quit those three what freed up about 20 GB of RAM. 
Now: Finder 470 MB (CPU 12%), iconservicesagent 40 MB, donotdisturbd 32 MB.
Also doesn't make any sense how those two tiny processes even got up there with the exact same amount.
My user had been logged out completely before this happened. RAM usage went up to 80% (50 out of 64 GB) again shortly after login and wasn't going down.
Now: Finder 470 MB (CPU 12%), iconservicesagent 40 MB, donotdisturbd 32 MB.
Also doesn't make any sense how those two tiny processes even got up there with the exact same amount.
My user had been logged out completely before this happened. RAM usage went up to 80% (50 out of 64 GB) again shortly after login and wasn't going down.
I agree, I don't think Apple dogfoods macOS at this point. Or they are just entirely out of touch with the UX ideals they used to hold close to their chest closer to when Steve was with us.
I 'upgraded' to Tahoe (26.2 release) last week and notice that the UI is about 500ms slower than on Sequoia, on all my 7 different macs. Opening a new Safari window is a good half second while a new tab is instant, even on a fresh install. even switching apps/windows is noticeably slower, even days after the install. Feels like I downgraded to an Intel mac. Anyone else noticing slowness?
Same here, even on M1 Max and M4 Pro. Especially worse on Intel 28c MP.
.3 Beta 1 is better, but not perfect.
Well most windows have an open/close animation now. Beyond that no I experience no slowdowns.
There was an update to 26.3 (a) Beta (25D770870b) (before it was 25D5087f):
Not here:
But at the bottom of the Privacy & Security settings:
I got some strange notifications about anything already yesterday. I can't remember what it exactly was. Something about apps after an update.
There was no notification about any update ready to install and I even rebooted in the meantime for other reasons.
Also no indicator in that System Settings section. But in there was this update ready to click on install manually, although already set to install automatically.
It also said it's just for testing purposes and doesn't include any fix before the installation.
My Mac immediately rebooted after clicking on install without any warning. Nothing special happened, it was like a standard reboot.
It can even be removed by clicking on (!).
Not here:
But at the bottom of the Privacy & Security settings:
I got some strange notifications about anything already yesterday. I can't remember what it exactly was. Something about apps after an update.
There was no notification about any update ready to install and I even rebooted in the meantime for other reasons.
Also no indicator in that System Settings section. But in there was this update ready to click on install manually, although already set to install automatically.
It also said it's just for testing purposes and doesn't include any fix before the installation.
My Mac immediately rebooted after clicking on install without any warning. Nothing special happened, it was like a standard reboot.
It can even be removed by clicking on (!).
Last edited:
Seems I missed this article:
Did this install automatically for anyone? I turned off all automatic updates in the Software Update section but it was turned on in Background Security Improvements.
support.apple.com
Did this install automatically for anyone? I turned off all automatic updates in the Software Update section but it was turned on in Background Security Improvements.
About Background Security Improvements for iOS, iPadOS, and macOS - Apple Support
Background Security Improvements delivers additional security protections between software updates.
Last edited:
Seems I missed this article:
Did this install automatically for anyone? I turned off all automatic updates in the Software Update section but it was turned on in Background Security Improvements.
About Background Security Improvements for iOS, iPadOS, and macOS - Apple Support
Background Security Improvements delivers additional security protections between software updates.
Happened to me, seems like it's just a test for now
Does anyone experience this as a bug?
It happens to me too, I hadn't noticed it before, really funny.Does anyone experience this as a bug?