What type of steps/sec will this run?

[diecastgit]

No sure if this is the correct place to ask, but I am interested in what sort of (KHz) step rate this will run up to, specifically on the ESP8266, but also interested for Arduino

[misan]

I have not performed a detailed testing. I think Arduino can do at least 10Khz and I would expect ESP8266 to be able to do 10x more at least.