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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'd be very wary about comparing Espruino running on the ESP8266 and running on something else connected to an ESP8266 by AT commands.
drainis fired during HTTP handling when the send buffer is empty, not on a timeout: https://github.com/espruino/Espruino/blob/09412d6a02830abeee16f9582c8c4c7cf0ea4df9/libs/network/socketserver.c#L277So it'll be very marginally faster if you keep the buffer full all the time.
I'd be pretty sure your issue is https://github.com/espruino/Espruino/blob/09412d6a02830abeee16f9582c8c4c7cf0ea4df9/libs/network/esp8266/network_esp8266.c#L763
the chunk size is 268 bytes, so it's only sending that amount each time - which probably results in a whole bunch of small TCP/IP packets being sent, rather than a few large ones.
Even so, 5 secs is particularly slow. You could take a look at
reqandres. In one of those there should be a field calleddSndwhich is the sent data buffer. You could check in an interval and see how quickly that's being emptied.