Once your keys are sorted, optimization is next. Here are the best settings to get high FPS, especially if you want "top" performance on a lower-end PC.
To play encrypted 3DS games on the Citra emulator, you need an file. This file contains the cryptographic keys required to decrypt game data, system archives, and features like Mii or amiibo support. How to Get "aes_keys.txt" citra aes keystxt download top
Select seeddb.bin -> Generate aes_keys.txt (or similar depending on version). Once your keys are sorted, optimization is next
Ensure it is in the sysdata folder specifically, not the root of the Citra directory. Once your keys are sorted
Hold the Start button while powering on your console to boot into the GodMode9 tool.