Woo hoo! I think you're right! I just set laptop to default and notes back to list view - I cannot get notes to use high CPU. NICE!!!!Happened across this thread when I noticed this on my new M1 MacBook Air and Big Sur 11.2.3. I have an external 4K screen on HDMI set to scaled (2x, so 1080p) and the internal screen set to the last setting (More Space). As soon as I set the internal display to default, the problem went away, even with the external screen still scaled. My guess is by using the 2x retina scaling for any screen, it doesn't cause the problem, because there's no additional scaling that need to happen ... 2x is normal.
What's weird is the "Default" for the internal screen on the M1 Air is a scaled resolution! (True 2x should be 1280x800; default is 1680x1050.) So I don't think my hypothesis is totally correct, but hey, at least I found a workable solution.Woo hoo! I think you're right! I just set laptop to default and notes back to list view - I cannot get notes to use high CPU. NICE!!!!
Bro, checking "use Rosetta to open" for Notes.app decreased the CPU usage for me!
Exact same thing happens for me on my 2018 MacBook Pro 15" i9, and that work around works for me too.The high CPU usage happens when you select the top note. In the list view, if you scroll the list of notes just enough such that your first note in the list moves off of the viewable scrollport, the CPU percentage immediately drops. (You need enough notes in the list, otherwise shrink the window height). As soon as you scroll back up all the way to the top, the high CPU consumption returns. The gallery view is fine because it avoids the scroll pane altogether.
1. Open Activity Monitor
2. Open Notes.app
3. switch from View > As Gallery to View > As List
4. Watch % CPU skyrocket to ~67% for both WindowServer and Notes processes in Activity Monitor, and hear fan start spinning
5. switch from View > As List back to View > As Gallery in Notes.app
6. Watch % CPU plummet to about 5-10% for WindowServer and 0% for Notes.app processes in Activity Monitor, and hear fan stop spinning
Note: This bug is described in detail at:
(a) Feedback Assistant Report #FB9085744 (according to https://forums.macrumors.com/threads/apple-notes-using-cpu.2268511/post-29804908)