Use Citra’s “Preload” setting with compressed ROMs for faster loading. On a 64 GB SD card, you can fit 50–70 compressed 3DS games versus ~20 uncompressed.
Why CHD is better than 7-Zip:
can trim ROMs directly on the console, ensuring you aren't wasting blocks on empty padding. how to trim specific ROMs or trying to find a way to shrink your current library for an SD card? 3ds games highly compressed