Speed up Android emulator in Windows

I've been complaining for years about the incredibly slow startup and bad responsiveness of the Android emulator.
I eventually started using genymotion, after having lost any hope to see Android emulator's performance increase. And two weeks ago, I accidentally found the secret to make the emulator much, much faster.
Here is this ancient secret revealed:

Open Android SDK Manager app, and install Intel x86 Emulator accelerator:

Actually, this step downloads the emulator accelerator, but it doesn't install it !
In order to install the accelerator, go to your Android sdk installation folder, and then launch extras\intel\Hardware_Accelerated_Execution_Manager\intelhaxm.exe:

Next time you start Android emulator, you will feel a huge difference !