I want to *emphasis* this bug has nothing to do with wikidata, as I confirmed the issue before we enabled wikidata on enwiki.
I've been having trouble consistently with editing [[en:New York City]] the past days that I've tried. And it's been an issue before with other large articles.
It takes like 30-40 sections just to load a page or revision of that article.
I takes longer it seems when I edit, hit save, then it times out and never reloads. My edits *do* get saved and I have to manually reload the page (as above, takes another 30-40 seconds) and I can see my change *did* save.
This is a horrible user experience for editing and does not make me want to actually edit and improve such Wikipedia pages. For a current events-related article, I'm sure the user experience would be next to impossible with edit conflicts and more.
At minimum, if we could increase the timeouts so a save and reload actually works would be great.
Generally, I'm hoping Lua and other stuff can help improve the experience but otherwise can't think of a specific solution to the general issue of slowness.
Version: wmf-deployment
Severity: critical