I’m generally finding that Sonoma is to blame, but the issues are caused by things specific to a given user’s set up, such as various ways you can use an external drive , Finder settings, screen sharing, settings, and even storage and memory configurations, etc. For example: Electric Light Factory found there’s a major memory leak when you set the Finder to larger icon views. Something that people who are in visually impaired, or just like big icons, should be able to use perfectly fine. However, Apple seems to have very little quality control these days, and misses things like this.
Myself, I have been reporting to Apple. Example is the fact that I can’t go to the Applications folder on my Mac Mini, and my Mac Studio’s screen sharing agent and Dock crash a lot, so I switched over to remote management, but I noticed that the remote management agent was using 600% of my CPU today, while I wasn’t connected through another computer.
Any issue I’m having on every computer running Sonoma is accessing external drives, especially those with folders with medium to large numbers of files, deeply nested folders, have incredibly slow access times. As a test, I test, I disconnected a USB 3.1 8TB RAID from my Mac Studio, then plugged it into my 2008 MacBook (that only has USB 2.0), and all of the files and folders are much faster on that old thing. Raw trans speeds were slower, but when you take into account file in the Finder, lock up for several minutes, and copying and modifying files, and Sonoma freezes up often, overall the 2008 MacBook running 10.8 mountain lion (which wasn’t even officially supported on that computer) much better.