What is best in performance excel or csv file

Performance comparison between Excel and csv while automating

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Hi @Sparks811,

CSV is a plain text format with values separated with delimiters, whereas Excel is a binary file that holds information (format, size, color etc.) about all the worksheets in a workbook.

So, by means of performance CSV files are faster and also consume less memory. On the other hand, Excel consumes more memory while importing data. For any programming language library to parse excel data is generally expensive, slower and complicated.

I hope it give you an idea whether to choose excel or csv.