Number of Device Limits?

We are running version 1.0.1 of LoRa App Server on a RPi and using HTTP integrations to ingest readings from LoRa App Server to an HTTP endpoint we have setup. At around 200 sensors attached to LoRa Server/LoRa App Server on the Pi (each with a 30 second update rate), we are beginning to see about a 3 minute delay between the time the reading comes in as packets on the LoRa side and the time we actually see the reading hit our HTTP endpoint.

Are there any known limits to the number of devices recommended for the type of integration we have set up? Anyone else seen something similar with a larger # of devices (i.e. delay in readings transmittal)?