Digital Foundry performed a loading test on the Nintendo Switch with the new Legend of Zelda Breath of the Wild game.
Results in summary:
Switch Cartridge – 35:45 seconds
Internal 32GB – 30:42
Sandisk 16GB Ultra MicroSD – 34:07
Sandisk 16GB – 34:27
For Legend of Zelda Breath of The Wild the Switch’s internal 32GB storage loads the fastest.