render-vs-prerender

JavaScript performance comparison

Revision 20 of this test case created

Preparation code

<canvas id="canvas1" width="640" height="480"></canvas>
<script>
  var can = document.getElementById('canvas1');
  var ctx = can.getContext('2d');
  
  var can2 = document.createElement('canvas');
  can2.width = 200;
  can2.height = 40;
  var ctx2 = can2.getContext('2d');
  
  var can3 = document.createElement('canvas');
  can3.width = 90;
  can3.height = 40;
  var ctx3 = can3.getContext('2d');
  
  
  function render(context) {
    context.font = "20pt Arial";
    context.fillStyle = "black";
    context.fillText('Hello World', 50, 50);
  }
  
  render(ctx2);
      
  
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
render
 
render(ctx);
 pending…
pre-rendered snug
 
ctx.drawImage(can2, 0, 0);
 
 pending…
pre-rendered loose
 
ctx.drawImage(can3, 0, 0);
 
 pending…

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