In the context of the device the parent comment describes the ESP8266 being quite slow doesn't really matter that much, it just needs to be fast enough to push

In the context of the device the parent comment describes the ESP8266 being quite slow doesn't really matter that much, it just needs to be fast enough to push whatever telemetry its collecting on a regular basis, which an ancient modem could probably manage. Not everything requires the ability to push data at 10s of Mbps.