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    <p>Alright I'm going to time it for you. Will edit to include more browsers (1000000 execution of either of your code) . Good browser test, too! Machine spec is i5 430M and 4GB RAM on win7 64bit</p> <p>Test code:</p> <pre><code>&lt;script&gt; function do1(){ p = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10, 23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87, 174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211, 133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208, 89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5, 202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119, 248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232, 178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249, 14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205, 93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180]; for (var i=0; i &lt; 256 ; i++) { p[256+i] = p[i]; } } function do2(){ p = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10, 23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87, 174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211, 133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208, 89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5, 202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119, 248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232, 178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249, 14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205, 93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180]; p = p.concat(p); } function timeit(func){ var date1 = new Date(); var start = date1.getTime(); for (i=0;i&lt;1000000;i++) func(); var date2 = new Date(); var end = date2.getTime(); alert(end-start); } timeit(do1); //timeit(do2); // uncomment to activate &lt;/script&gt; </code></pre> <p>Chrome 11</p> <p>Method 1 (loop):</p> <ul> <li>4669ms</li> <li>4809ms</li> <li>5103ms</li> <li>5025ms</li> <li>4786ms</li> </ul> <p>Method 2 (concat):</p> <ul> <li>387ms</li> <li>370ms</li> <li>494ms</li> <li>640ms</li> <li>394ms</li> </ul> <p>Opera 11.1 (3 tests.. takes to long)</p> <p>Method 1 (loop)</p> <ul> <li>7884 ms</li> <li>7621 ms </li> <li>7546 ms</li> </ul> <p>Note: For one of my run I got > 98000ms .. IDK what happened.</p> <p>Method 2 (concat)</p> <ul> <li>27684 ms</li> <li>28479 ms</li> <li>23539 ms</li> </ul> <p>IE 9 </p> <p>Method 1 (loop)</p> <ul> <li>6065ms</li> <li>6026ms</li> <li>6214ms</li> </ul> <p>Method 2 (concat)</p> <ul> <li>8064 ms</li> <li>8105 ms</li> <li>7954 ms</li> </ul>
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