https://github.com/freeall/progress-stream/blob/master/index.js#L14
var speed = speedometer(options.speed || 5000);
This looks like it is passing speedometer milliseconds but according to these lines in speedometer source:
https://github.com/mafintosh/speedometer/blob/master/index.js#L10
https://github.com/mafintosh/speedometer/blob/master/index.js#L16
module.exports = function (seconds) {
...
var size = resolution * (seconds || 5)
It is expecting seconds, so it looks like you are defaulting the speed to 5000 seconds.