If this is the case and you want to push it harder.
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You can reduce rate limits, this will allow users to interact more aggressively with Discourse. Specifically you could double
DISCOURSE_MAX_REQS_PER_IP_PER_MINUTEandDISCOURSE_MAX_REQS_PER_IP_PER_10_SECONDS -
You can try adding more unicorn workers
This is expected temporarily while you are overloaded, but stuff should automatically recover once load is reduced.
My guess here is that this is all just rate limit related, the rate limits are new, and there to protect the server, it appears your server is being protected by design.