In this video I am demonstrating that the Nintendo Switch can play PS1 games at full speed using DuckStation emulator.
To get this to work you got to have a Nintendo that can boot in Android and pair the joycons, download the DuckStation emulator from the Google Play store and you are all set. Put the bios and BIN and CUE files in a folder of your choice. Set graphic rendering to "Vulkan".
The games tested are Castlevania Chornicles, Twisted Metal and Megaman X5.