Open .xlsx file once and read multiple sheets

[mfairley]

I'm reading many sheets from a single .xlsx file and it's taking quite some time. Is there a way to open the file once and read multiple sheets to improve performance like in ExcelReaders.jl? Could an example of doing this be added to the read me?

[davidanthoff]

Not possible right now, and we would have to think what the right API here is and how it can be integrated with the general File IO API.