Same opinion as holli, I would not worry about 4500 lines, or not even about ten or twenty times as many. These are really not large data sets.

I'm dealing almost daily with files with tens of millions of lines (and sometimes with even hundreds of millions), there I might have to worry about performance, but not with tens of thousands.

In reply to Re: Reading and Writing from / to XLSX file (optimization) by Laurent_R
in thread Reading and Writing from / to XLSX file (optimization) by thanos1983

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