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@JorisMeys For example, the 2019 World Risk Poll is a global survey of fears and attitudes towards risk. It has lots of demographic detail too so you can simulate the effect of different sampling strategies.

It's a 70 MB plaintext spreadsheet with 150,000 rows. It's large enough that in my last visit to the Apple Store, I could compare devices by manually timing how long it took to open the file. (It took 7 seconds on anything with an M4 chip; 5 seconds with an M5.)

https://datacatalogue.ukdataservice.ac.uk/studies/study/8739#details

@JorisMeys It might be an obvious choice, but the UK Data Service hosts many datasets. A minority of the datasets are open, and they tend to be pretty clean already, but the massive scale of some of them makes them interesting.

https://datacatalogue.ukdataservice.ac.uk/