since discussion has drifted to comparing boot times:
my old 16mhz 386 pc with quick start bios takes about 250ms to dos prompt ready to edit and assemble or compile with turboc 2.1
esp8266 starts running custom flashed code in about 600ms. espressif AT prompt about 3 sec. lua or python or any other code with spif several more seconds to get going.
my 3.3ghz pc gets through the bios and into real mode msdos in about 8 sec. boot to xp desktop about 15sec.
rpi0 with an older minibian able to run user program, editor, or start gcc compile in about 10 sec. jessie may take a up to minute depending.
establishing an internet connection on any of those last ones (pretty much mandatory) may take 3 minutes or more. and you better not power down those last couple w/o asking the machine for permission!
ahhhh.... the benefits of modern technology.