To load? That's not the point here. All emulated devices require some loading time. What is needed is fast execution and Genymotion is a lot faster than the official emulator. It's probably the best choice for an emulator.
I do agree that a real device is better than an emulator but no one has hundreds of devices at hand so using an emulator is mandatory to try various screen resolutions, screen ratios or OS versions. Genymotion is very close to what you get on a real device. You can even reproduce the OS bugs.