colsep = "\t" ĭoubletostring := Internal`DoubleToString It allows for specifying how many digits have to be exported. However, the following can export the data within 1.6 seconds while the OP's version took 15.985 seconds on my machine. for such a simple task as exporting an array). After using them for several years, I have to admit that many Export routines in Mathematica are either broken or way too slow (a factor of 10 to 25 when compared to a "C++" routine, e.g.
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