[Feature Request]: Open files >1000 columns faster

[tomtomme]

Description

importing many columns is still kinda slow, at least on linux.

data-4000column.csv

This file needed 100 seconds to import, while libreoffice calc just needed 3 seconds.

Additional context

-------- Application Info --------
JASP Version: JASP 0.95 beta

[tomtomme]

even bigger file to test this here:
#3282

[JorisGoosen]

This should be better now