The crew's portraits drawn as often as the game draws its frames. The game redraws them only seven to ten times a second, which is why the faces jerk.

For KSP 1.12.x. Needs Keystone.
Works on: Mac: tried. Windows 11: 0.1.2 tried. Linux: not run.
More pictures, every setting and how it works: on GitHub.
Raw stats are from the beginning of time until now. Each follower and download entry represents one hour of data. Uneventful hours are omitted.