Hey,
Yesterday, when the API was off for third-party sites, i was still dealing with occasional lag while doing activities (noticed specifically when doing Operation: Seraph's Shield).
While extra traffic from the API being on might be making issues worse, it seems like it's just triggering the issue, not the actual underlying cause.
Cheers,
Monk
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Working fine for me and tons of others in our clan... We have a household of 4 players and no more issues since the API was disabled