[SOLVED] Sonoff BASIC Tasmota MQTT bad performance

Just to pin point this issue

If the Sonoff switch is slow to answer MQTT commands or seems to disconnect, try this :

When building your firmware, use the ESP8266 2.3.0 Core (instead of latest 2.4.x)

It was a drastic improvement for me.

Note: All the “official” binary firmware available here are using the 2.3.0 libraries