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Thank you! 😊

Slowdown on the NES is a hardware issue, the emulator usually meant to represent the hardware as closely as possible. It's caused by  too many sprites on screen at once. Most games use sprite flickering to control the slowdown, by swapping which sprite gets flickered at a given time. A feature I hadn't implemented yet.

Try using MESEN to emulate, I have had good results so far with their codebase.