title: Movement slower when canvas is bigger
body: <p>Using this code:</p>
  
  <pre><code>x = x + (canvas.height/250);
  </code></pre>
  
  <p>which happens every 1 millisecond should add an amount to x in proportion to the canvas size. x is then drawn so therefore x should move down the canvas at the same speed on different screen sizes (the canvas changes size according to the screen size). However the x moves down at different speeds on my ipod and my pc.</p>
  
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