2021 MacBook Air slows until reboot
My MacBook Air is about 9 months old and has had a weird quirk for awhile. All processes gradually slow down until I reboot, and that resets everything to normal snappy performance. This has nothing to do with internet/network speed -- it affects all system processes, such as opening apps, saving files, opening files, or copy-pasting items. It usually takes about 3-4 days until saving a JPEG out of Photoshop takes a full minute of spinning beachball to achieve, at which point I reboot, and everything will work fine again.
I don't have any virus or scanning software installed.