When the Toolbar sticky behavior is set to 'Disabled, show on scroll-up' AND the current page contains a sticky table header (e.g. /admin/content), the interaction between the transitioning toolbar and the table header is not always smooth (see video below).
This may be difficult to completely resolve given that Drupal.displace() cannot accurately recalculate offsets until the show/hide transition has completed, but it may be possible to make incremental improvements.
Set Toolbar sticky behavior to 'Disabled, show on scroll-up
Scroll up/down a page with a sticky talble header
Consider deferring the call Drupal.displace() with a delay value that is as close to the transition duration as possible. Defining those durations as CSS properties would make them available to javascript.
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While technically not the smoothness jank in the video, it falls under improving the show/hide transition. If you scroll down slightly and then stop there's a blank gap at the top of the screen. Thiscould happen if someone just needs to read something barely below the fold.
Having the hide event only fire after 79px down or w/e would solve this.