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!