https://bugs.kde.org/show_bug.cgi?id=478508

Alexander Semke <[email protected]> changed:

           What    |Removed                     |Added
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             Status|REPORTED                    |CONFIRMED
     Ever confirmed|0                           |1

--- Comment #3 from Alexander Semke <[email protected]> ---
(In reply to Francisco Ulloa from comment #2)
> Created attachment 164162 [details]
> Project file plus file imported into spreadsheet
> 
> The zip folder contains the project file after importing the example file
> into a spreadsheet and saving it.

your project file has 20 datetime columns with each having 21.5k rows. So, we
have to read in total 430k datetime values. Parsing datetime is expensive and
this explains why it takes so long. On my old Intel(R) Core(TM) i5-6500 CPU @
3.20GHz it takes 12s for example and on the newer AMD Ryzen 7 7700X it takes 6s
only. So, the faster the hardware the faster the import in this case. 

We'll check how to further optimize the import datetime data so it's also
faster on slower hardware.

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