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What? I can't tell if you're trolling, but I'll answer anyway...

The Android emulator allows you to run applications that were compiled for ARM because it translates the ARM instructions to x86. This is really CPU intensive and can eat a lot of memory as well.

Technologies like Intel HAXM[0] speed this up, which is how the x86 Android images manage to be so much faster than the regular ARM images.

[0]: http://software.intel.com/en-us/articles/intel-hardware-acce...

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