Stuttering sticky header on Safari

Environment info

• Browser, version, OS, platform: Safari (iOS/MacOS)
• Instance URL: https://cd0.nl
• Frontend version (see settings -> about): 3a507ba9 & DEV
• Backend version (see settings -> about): 2.5.0
• Browser extensions (ublock, rikaichamp etc):
• Known instance/user customizations (i.e. pleromafe mods/forks, instance styles etc)

Bug description & reproduction steps

The Timeline sticky header stutters when scrolling on iOS or Safari on MacOS. The "stickyness" is implemented trough CSS and should work fine, but there seems to be a rounding/performance issue.

Screen_Recording_2022-12-26_at_20.58.46

Bug seriousness

• How annoying it is: Little bit annoying, but nothing more.
• How often does it happen: Always
• How many people does it affect: 🤷
• Is there a workaround for it: Ignoring it

EDIT:

The sidebar has the same issue