Since several days (perhaps a few weeks), https://www.mediawiki.org/wiki/Special:Watchlist takes many seconds to load (23 seconds time to first byte right now), every single time I attempt to open it.
As I removed all "Thread" pages from watchlist before the LQT conversion, I only have 3300 pages in watchlist. I use 0 days, 1000 changes, extended watchlist and enhanced watchlist in https://www.mediawiki.org/wiki/Special:Preferences#mw-prefsection-watchlist , which is arguably the heaviest configuration possible, but hardly extraordinary with so few pages.
On all other wikis, things are still fine, hence I suspect this has to do with Flow. Can someone provide a script or trick to remove all pages with a Flow talk page from my watchlist, to verify?