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On an M1 Pro MacBook that I am using as a test (at the moment, my mini M4 Pro and, in particular, my mini M4 ‘server’ running Security Spy remain with Sequoia), apart from the questionable (horrible) graphic choices that will take years to be consistent between the system and third-party applications (hell, even between the system and the system itself), Tahoe 26.2 seems to be fast (perhaps even more responsive than Sequoia, but that's a matter of ‘feeling’), and the resources used are normal. (Installation always via pkg installer)
 
My M1 MacBook Air 8 GB has no noticeable performance downgrade with Tahoe 26.2, and working like Sequoia.

But it's causing serious problem for some Firefox users. The browser hangs up on Tahoe. Some Tahoe's native functions (including Spotlight) are causing this and it's been reported by Firefox users since Tahoe Beta for months.
 
Update: Weeks after I've upgraded to Tahoe 26.2, my evaluation has changed now and my M1 MacBook Air 8 GB has serious problems in terms of the performance, especially when using Firefox.

Firefox freezes frequently, when launching some other apps like Apple Books, Apps (macOS native apps), Spotlight, etc.
 
Update: Weeks after I've upgraded to Tahoe 26.2, my evaluation has changed now and my M1 MacBook Air 8 GB has serious problems in terms of the performance, especially when using Firefox.

Firefox freezes frequently, when launching some other apps like Apple Books, Apps (macOS native apps), Spotlight, etc.
Thanks for your updated feedback. What a crappy OS is.......
Then I will stay on macOS 15.7.x.....
 
Thanks for your updated feedback. What a crappy OS is.......
Then I will stay on macOS 15.7.x.....
I think it's the best option.
I have two Mac mini M1 at home. On mine (which I always updated to the latest version and the Mac continued to run very well), I had to downgrade to 15.7.3, and now it's running smoothly again, just like always.

I recently got my girlfriend another Mac mini M1 at a great price and immediately installed 15.7.3 on it. My father bought a Mac mini M4 and it was working well for him, although with the latest system versions he says the computer is slow… unbelievable. He mainly uses it for Photoshop with some plugins. He doesn't want to downgrade it because he says it was difficult to configure the plugins (it's his first Mac), but I think if he went back to Sequoia, his performance problems would be over (an M4 and 16GB of RAM should be more than enough for his use; he doesn't work with a thousand layers and effects in Photoshop…).

My advice: go back to Sequoia (both M1 I have at home are the basic 8/256 version).
 
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