Commits on Feb 10, 2021

1. searchtools: Don't use slideDown to show search results. …

   Fixes a performance issue with massive lists like sphinx-doc#8562.
   
   jQuery.slideDown is pretty bad perf-wise since it thrashes layout
   multiple times.
   
   The 5ms animation is unnoticeable (it last less than an animation
   frame!) and just burns CPU cycles unnecessarily in all browsers.
   
   On Firefox this is specially bad because it hits a performance cliff
   with list items / CSS counters
   (https://bugzilla.mozilla.org/show_bug.cgi?id=1683910#c26 for all the
   gory details) where it causes tons of counter recalc.
   
   An alternative fix for the Firefox cliff would be to set overflow:
   hidden on the list item, but I think removing the animation is probably
   more sensible, given that as I said it's just burning CPU.
   
   Fixes sphinx-doc#8562

   

   emilio committed Feb 10, 2021
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