Set the audio emulation stretching settings to "auto" or lower the internal rendering resolution if your CPU is bottlenecking. To help you get the best setup, tell me:
Set this to 4x Native (1600x960) for 1080p displays, or 6x Native (2400x1440) for 4K screens.
Open the emulator's custom texture directory for Ultra Sun and paste the files there. Enable "Load Custom Textures" in the graphics menu. pokemon ultra sun decrypted high quality
Pokemon Ultra Sun Decrypted High Quality: The Ultimate Emulation Guide
Even with a "High Quality" decrypted file, you may hit snags. Here is the fix list: Set the audio emulation stretching settings to "auto"
Once you have your decrypted ROM, you will likely be using the .
Intel Core i5-8400 or AMD Ryzen 5 3600 (Single-core performance matters most). Enable "Load Custom Textures" in the graphics menu
What (Windows, Android, Mac) are you using? What graphics card/processor does your system have? Share public link