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    $\begingroup$ This question might be useful $\endgroup$ Commented Jun 27, 2012 at 9:12
  • $\begingroup$ This discussion may also be relevant. $\endgroup$ Commented Jun 27, 2012 at 9:39
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    $\begingroup$ @Mr.Wizard Yes, I can. But then, have a look at the listSplit function in my third post here :-) $\endgroup$ Commented Jun 27, 2012 at 9:56
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    $\begingroup$ @Mr.Wizard dynP is about 40-50 % faster on my test: test = Flatten[Range /@ Range[5000]];, and then dynP[test, Range[5000]], and similarly for the internal function. $\endgroup$ Commented Jun 27, 2012 at 10:08
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    $\begingroup$ @Mr.Wizard But, if we convert test to packed array with Developer`ToPackedArray, then the internal function is a little faster. I would generally mention in your answer that for packed arrays, your function creates a ragged list where however all sublists remain packed (because Part does not unpack). This allows for much faster execution and vastly more efficient storage as well, even though the resulting array is ragged. $\endgroup$ Commented Jun 27, 2012 at 10:29