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    $\begingroup$ This is a very long post considering how little novel insight it offers. Leonid (and the documentation) has already warned us about using CopyTensor excessively. The number of lines in C does not really correlate with evaluation speed: sometimes it is more fast if steps of a loop are explicitly written (more lines) then put in a loop. For successive list building, Internal`Bag is one really fast solution. A better, more concise summary would be more useful than all the CompilePrint output. $\endgroup$ Commented Feb 15, 2014 at 15:03
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    $\begingroup$ You are right. I'm trying to do it shorter and more concise, but as you are an expert so maybe your point of view is different with the beginner's view. $\endgroup$ Commented Feb 16, 2014 at 10:28
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    $\begingroup$ Sure DaoTRINH, you're right about the viewpoints (though I don't consider myself an expert), and it is most important that you did a systematic investigation of the problem! Sorry for the blunt comment, keep it up, such approaches will do good use for the community :) $\endgroup$ Commented Feb 16, 2014 at 14:56