mathematical expressions - Mathematica is getting slow when repeatedly starting an external program -

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i found strange phenomenon mathematica getting slow when repeatedly started external program using readlist. example, following code display significant increase of cpu time each 'ls' command (my platform os x):

data = table[timing[readlist["!ls"]], {100000}][[all, 1]]; listplot[data]

this phenomenon seems ubiquitous other external programs. can suggest me how avoid speed down?


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