Preparation code

<canvas id="c"/>
<script>
  Benchmark.prototype.setup = function() {
    var ctx = document.getElementById("c").getContext("2d");
    var canvas2 = document.createElement("canvas");
    var ctx2 = canvas2.getContext("2d");
    ctx2.canvas.width = ctx2.canvas.height = ctx.canvas.width = ctx.canvas.height = X = 500;
    ctx2.fillRect(0, 0, X, X);
  };
</script>

Preparation code output

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ctx.fillRect(0,0,X,X);

ctx.drawImage(canvas2, 0, 0);

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