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Test Info:

<!DOCTYPE html>
<html>
<body>
<canvas id="c" width="500" height="1000">
</canvas>
<script>
var ctxt = document.getElementById('c').getContext('2d');
for (var k = 0; k < 100; ++j) {
for (var j = 0; j < 10; ++j) {
for (var i = 0; i < 1000; ++i) {
gradient = ctxt.createLinearGradient(0,0,200,i);
gradient.addColorStop(0,'black');
gradient.addColorStop(1,'rgba(0, 255*k/100, 0, 0.1)');
ctxt.fillStyle = gradient;
ctxt.fillRect(j*50, 2*i, 50, 2);
}
}
}
</script>
</body>
</html>