Unfortunately, since Cen64 is relatively new, it doesn’t have a UI yet. All you need is an Intel Core i5 4670K at the minimum to enjoy decent frame rates.
The best part is that Cen64 doesn’t demand better hardware to make games playable. Despite its young age, it’s a good choice, as it focuses on high accuracy and aims for quality gameplay. The Cen64 is one of the newest emulators on this list. That makes it a great all-around emulator for Windows users. Furthermore, the emulator also supports other older consoles like Atari, Gameboy, Sega, PlayStation, and more.
Even if aren’t a speedrunner, BizHawk is still a solid choice, emulating games accurately and with few to no problems.