Cartridges or optical discs?

[Pemalite]

SvennoJ said:

How do you get to that conclusion. The article clearly states it maxes at UHS-1 speeds. That UHS-1 card they used has upto 80 MB/s read speed. And the game from cartridge loads slower than from an UHS-1 card. It's not useless but below 80 MB/s for sure. Too bad they didn't test slower cards to see how they hold up.

Anyway it's not the goroundbreaking difference with discs that people seem to assume when switching to cartridges. Lego city undercover still takes 51 seconds to load on Switch, compared to 1:04 on WiiU, yet much slower than on ps4 wich loads in about 30 seconds.

Just throwing out rough guestimates as we don't actually have any real-world transfer rate data on-hand, something that Digital Foundry hints at.
One thing to keep in mind is that the load times between Cart and the MicroSD is extremely minimal, within a possible margin of error.

And with the 16GB UHS-1 card having a max of 80MB/s... And the fact that Nintendo also has varying degrees of ROM capacities and potential speeds... Well you get the idea. 80-90MB/s is probably on the upper-end of cart transfer rates.
Carts with smaller ROM chips will probably get significantly less than that.