The fade animation for enabling and disabling f.lux is choppy
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For a very long time now (a few years?), the fade animation (like when disabling for an hour, or when it disables for fullscreen apps, or when using the keyboard shortcuts to change the color temperature) has been choppy, but it's smooth when the f.lux window is open. As soon as it hides/dismisses itself, the fade animation becomes choppy, especially the fast transition.
So its as though the fading animation gets a very low framerate when the f.lux window goes away. This is most noticeable when going from 800K to 6500K (or some other huge transition like that). Just in case this helps you track it down, I think I've had this ever since you put in the different transition speeds.
When the color temperature changes at sunset and sunrise though, it's smooth.
This has followed me through Windows 10 with lots and lots of updates to Windows 10, including major ones, a couple of reformats, a new computer that I built (I didn't reuse any of the old parts when I built it), and now Windows 11. So I am just about 100% sure at this point that it's a problem with f.lux not some part of my computer or my display driver or anything like that since I have a completely different system and it's still doing this.