ESP8266 Community Forum

I'm beginning to play with a new Huzzah esp8266 module, using Ardino 1.8 IDE.
Everything working fine but it takes 40 seconds or more to upload a tiny sketch. I assume it's uploading 200k or so of the Arduino core code as well as my sketch.
Is there any way that core code can be permanently stored in the module so that the bootloader only has to upload my new code each time?

Have you tried increasing the speed IDE, tools, upload speed), I can generally upload at 512000 and with some modules 962100. The default 115200 speed is generally chosen to deal with device production spreads, but most work at full speed (962100), try it and see. In answer to your specific question - no it's always a full upload.