Well, thanks for your understanding. I'll admit there is a lot of frustration building up on my side by using PM exactly like this for many years now.
I looked back through your posts and I saw that you had performance issues in the past (seemed to coincide with macOS Ventura upgrade that killed PM's performance and I had to do major reworking of our screen drawing tech to fix), but I did not see a post from you where the later versions did or did not fix the performance issue.
And now seeing that the new codebase didn't change anything either but yet prices have gone up dramatically. I have adjusted, try to avoid any accidental scrolling and only have PM open in an as small a window as possible in the background to maintain decent culling speed in the single preview window.
What I think has improved a lot is that not as many pictures are skipped or displayed pixellated any more when quickly culling in preview window. I remember on the old codebase as a fix it then just began skipping images if it fell behind and shows a lot of images pixellated for some delay. It now takes quite a bit more images for them to become pixellated (which they still do on my M1).
Anyways, back to the issue: My display settings are attached with and without the external screen attached. Arguably only internal screen is even a bit worse.
Thanks for the screenshots, I'll have to do some translations to understand your settings.
By the way the issue comes from moving the mouse slightly while scrolling, which is normal with using a magic mouse but impossible with a touchpad. So if you don't have an external mouse on your developer machine, try to use one. You can also trigger the ussie by scrolling with the touchpad and then moving the external mouse.
If you use only the cursor (arrow) keys or page up/down to scroll the contact sheet and don't touch any mouse input device, is the scrolling speed in the contact sheet quick?
I did notice from your video that the mouse movements were very erratic and the hover buttons were blinking rapidly which I have never seen before.
I only have an Apple Magic Mouse (no touch pad at all). Should I be able to reproduce the issue without a touch pad and only with the Magic Mouse?
Thanks for following up. It is my goal to have PM perform well on all kinds of user's systems.
-Kirk