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Looks like accessing array backwards is slow, but not because of while.

http://jsperf.com/html-canvas-performance/3

same perf with following code

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;

Looks like accessing array backwards is slow, but not because of while.

http://jsperf.com/html-canvas-performance/3

same performance with following code for me.

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;

Looks like it is accessing array backwards is slow, but not because of while.

http://jsperf.com/html-canvas-performance/3

same perf with following code

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;

Looks like accessing array backwards is slow, but not because of while.

http://jsperf.com/html-canvas-performance/3

same perf with following code

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;

Looks like it is just because of array have to initialize backwards.

http://jsperf.com/html-canvas-performance/3

same perf with following code

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;

Looks like it is accessing array backwards is slow, but not because of while.

http://jsperf.com/html-canvas-performance/3

same perf with following code

var i = 0, z = e.length;
while(i < z) e[i++] *= 123;