From there, go to Settings > Input > Hotkeys. If you feel like an octopus holding E while also gaming, visit RetroArch's main menu. To use it, hold E on your keyboard, and the game's action will slow down enough to feel like bullet time.
It's extra helpful on classic platformers and shooters, where precision is vital. Slow Motionīy reducing an emulated game's frame rate, RetroArch offers the equivalent of slow motion. Alternatively, if you haven't remapped them, you can use F2 and F4 to save and load a state, respectively.