Division vs. multiplication

JavaScript performance comparison

Test case created by Solenoid

Info

Tiny performance test to see how much a division costs when projecting 3d points to screen.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var focalLength = 3.015;
   
    function slow(x, y, z)
    {
    return {x: x*focalLength/z, y: y*focalLength/z};
    }
   
    function fast(x, y, z)
    {
    var k = focalLength/z;
    return {x: x*k, y: y*k};
    }
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Slow
slow(3, 5, 7);
slow(3.23, 5.32, 7.01);
pending…
Fast
fast(3, 5, 7);
fast(3.23, 5.32, 7.01);
pending…

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