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Switching to edit mode for labels is very slow when a lot of languages are shown
Open, Needs TriagePublicBUG REPORT

Description

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

What happens?:

It takes a very long time for the edit fields to appear. On this computer it takes 99 seconds in Chrome-based browsers and 45 seconds in Firefox.

What should have happened instead?:

It should not take more than a couple of seconds.

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

Other information (browser name/version, screenshots, etc.):

Event Timeline

I can confirm.
It seems to be much better on the new mobile termbox. Since the medium-term plan is to replace the desktop termbox with that one I think we should spend the time on getting that in shape than optimize the current desktop termbox. One major piece that is still missing before that can happen is the language fallback on the mobile termbox which we are tackling now in support of the mul language code in T330183.