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Slow language selector rendering
Open, Needs TriagePublicBUG REPORT

Description

Steps to replicate the issue (include links if applicable):

  • Open https://en.wikipedia.org/wiki/Bread . I suppose this happens on any article that is available in large number of other languages
  • Click drop down "193 languages" in top right corner
  • Wait until it completely renders

What happens?:
Language selector appears about changes flow in a couple of seconds. Elements, links might change places. Often this leads for me to clicking on the incorrect link.

What should have happened instead?:
Language list should appear immediately

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):
Firefox 118.0.2
Here is the trace: https://share.firefox.dev/46CZJcB

Event Timeline

Tacsipacsi subscribed.

I’ve been experiencing seconds-long freezes when language selector for the first time after page load on Special:Translate (which also uses UniversalLanguageSelector, but always shows all languages), except that I’ve never seen anything change places (which might be exactly because all languages are shown, not only many). It’s probably the same root cause since it’s the same piece of software.

For what it's worth, I can report that this problem doesn't replicate when using the Vector legacy (2010) appearance skin.