Is your default android emulator slow?

To speed up your Android development install Intel HAXM, a hardware-assisted virtualization engine that uses Intel VT.

Intel HAXM for Windows

Intel HAXM for MAC

Note:
Intel HAXM can be used only with Android x86 emulator images provided by Intel. 
Intel HAXM cannot be used with ARM Android emulator images or non-Intel x86 Android emulator images.