Baud Rate on ESP8266

Try the following and see if it makes any difference:

var ESP8266 = require("ESP8266");
ESP8266.logDebug(false);
s = getTime();
for (var i = 0; i < 25; i++) {
  digitalWrite(D5, 1);
}
e = getTime();
console.log("Seconds:" + (e-s) / 25);