Math.floor vs Math.round vs parseInt vs Bitwise
JavaScript performance comparison
Info
Rounding in all form possible
Preparation code
<script>
Benchmark.prototype.setup = function() {
var a = Math.random() * 1000;
var b = Math.random() * 1000000;
var c = Math.random() * 1000000000;
var d = Math.random() * 10;
};
</script>
Test runner
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Java applet disabled.
Test  Ops/sec  

Math.floor 

pending… 
Math.round 

pending… 
parseInt 

pending… 
Bitwise  

pending… 
Bitwise 

pending… 
Bit flipping 

pending… 
zerofill right shift 

pending… 
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