render-vs-prerender

JavaScript performance comparison

Revision 141 of this test case created by

Preparation code

<canvas id="canvas1" width="1800" height="900"></canvas>
<script>
  var can = document.getElementById('canvas1');
var ctx = can.getContext('2d');

var context= document.createElement('canvas');
context.width = 1800;
context.height = 900;

var can2 = document.createElement('canvas');
can2.width = 256;
can2.height = 256;

var ctx2 = can2.getContext('2d');

var can3 = document.createElement('canvas');
can3.width = 512;
can3.height = 512;
var ctx3 = can3.getContext('2d');

function render(can) {
    for(var i = 0; i< 3; i++){
        can.drawImage(can3, 0, 0);
    }
}

function render_snug(can) {
    for(var i = 0; i< 3; i++){
        can.drawImage(can2, 0, 0);
    }
}

function pre_render(context, can) {
    for(var i = 0; i< 3; i++){
        context.drawImage(can3, 0, 0);
    }

    can.drawImage(context, 0 , 0);
}

function pre_render_snug(context, can) {
    for(var i = 0; i< 12; i++){
        context.drawImage(can2, 0, 0);
    }

    can.drawImage(context, 0 , 0);
}
</script>
    

Preparation code output

<canvas id="canvas1" width="1800" height="900"></canvas>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
pre-rendered snug
pre_render(context, can);
pending…
render snug
render_snug(can);
pending…
render
render(can);
pending…
pre-rendered loose
pre_render_snug(context, can);
pending…

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Revisions

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