Inventory & Tradelist loading glacially slow

Over the past few days, I've noticed that the Inventory & Tradelist pages are timing out constantly and failing to load, as are many of the JSON requests around them; adding to inventory, adding to decks, card name search, etc. The home page is mostly fine, as are these forums. Opening up a browser console, https://deckbox.org/sets/47424 hangs in the pending state and eventually the browser terminates the request.

Often the _second_ request will work, but then trying to sort by modified date times out again, and this one never comes back.

Headers:

Request URL: https://deckbox.org/sets/47424
Referrer Policy: no-referrer-when-downgrade
Provisional headers are shown
Referer: https://deckbox.org/
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537.36

Tried with and without uBlock enabled, seems to make no difference.