Poor performance when decrypting 2+ keys

[Rufus-L]

Hey,
I'd like to know why it takes about 2-3s to decrypt one key, but then it gets a lot worse for subsequent keys (12-15s). Is it possible to improve that?

That happens either running with Node or Web browser.

var bip38 = require("bip38");
var keyList = ["6PnQYMjJ7ZXpX8rbh8b6PfzK38WG5KL9mGqscB2RXFGb4ZKwXBaP5gMmhC", "6PnPNwvsTy3jeogyENrV23F15om4ecbEmFZcYrjrTsPgvKEwfnubVEAEEc"];
var password = "123";

for (var key of keyList) {
  var t0 = new Date().getTime();
  bip38.decrypt(key, password);
  console.log((new Date().getTime() - t0) + " ms");
}

[dcousens]

A sample of 2 keys is probably not a great example, but, I'd be happy to look into this. It is likely this is a hot-spotting issue from the VM mis-optimizing the code.

Are you experiencing this consistently?

[Rufus-L]

I used a sample of 2 to make the code simpler. The result is always the same: first one is quick, all the others take about 5x the time.

That happens everytime. Even if the 1st and 2nd keys are the same.

[dcousens]

Reproduced. 5x.
Will investigate...

[dcousens]

Closing in favour of cryptocoinjs/scryptsy#8