If that's a problem, I'd assume you could shard your SUP feeds any number of ways. Say... first 100k feeds reference sup1.json, second 100k reference sup2.json

If that's a problem, I'd assume you could shard your SUP feeds any number of ways. Say... first 100k feeds reference sup1.json, second 100k reference sup2.json, etc. And given that each RSS/Atom feed <links> to its SUP feed, you could reorganize arbitrarily by updating the link, and the poller should pick it up on the next go-around.