Rate limit in WorldServer API?

Does anyone know if there is a rate limit affecting WorldServer response? We have been plagued by a slowness issue, which we have tracked down to a change in an SAP environment that connects via the REST API to WorldServer. Ping and Tracert indicate there are no network issues; the server itself shows no unusually high CPU or memory utilization. Google Inspector shows times in the ms-range for receiving requests. What we do see are long TTFB (time to first byte) times. Could it be that there is a rate limit causing responses to be buffered and sent out after a delay, the length of which unfortunately causes the connection to the SAP system to time out?

We are taking steps to reverse the change in the SAP environment that led to this issue, but it would still be good to know for the future!

Thanks in advance!

Dave

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