render-vs-prerender

JavaScript performance comparison

Revision 90 of this test case created by

Preparation code

<canvas id="canvas1" width="1024" height="1024"></canvas>
<script>
  var can = document.getElementById('canvas1');
  var ctx = can.getContext('2d');
  
  var can2 = document.createElement('canvas');
  can2.width = 100;
  can2.height = 40;
  var ctx2 = can2.getContext('2d');
  
  var can3 = document.createElement('canvas');
  can3.width = 512;
  can3.height = 512;
  var ctx3 = can3.getContext('2d');
  
  function render(context) {
    context.font = "20pt Arial";
    context.fillStyle = "black";
    context.fillText('Hello', 64, 64);
  }
  
  render(ctx2);
  render(ctx3);
</script>
    

Preparation code output

<canvas id="canvas1" width="1024" height="1024"></canvas>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
pre-rendered loose
ctx.drawImage(can3, 0, 0);
pending…
pre-rendered loose clipped
ctx.drawImage(can3, 0, 0, 100, 40, 0, 0, 256, 256);
pending…
render
render(ctx);
pending…
pre-rendered snug
ctx.drawImage(can2, 0, 0);
pending…
pre-rendered snug resized
ctx.drawImage(can2, 0, 0, 200, 80);
pending…

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