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RequestAnimationFrame & deltaTime inconsistancies

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var lastTime = 0;
var deltaTime = 0;

function update(timeStamp) {
  deltaTime = timeStamp - lastTime;
  lastTime = timeStamp;

I'm building an html5 browser game (without phaser or pixi) I'm having problems with getting consistent deltaTimes with this very simple example.

I get different results based on what platform I use:

my PC: ~16

my iPhone ~11

my Mac using Firefox: 24-27

This obviously has a giant impact on how the game displays. What am I doing wrong? Tried searching around, but can't find any answers.

What can I do to get consistent deltaTimes?

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