What you're experiencing is a fault of Android emulator.
It's a really slow and poorly optimized piece of software.
When you run a native library, even if you can provide if for x86 platform, the emulator translate the ARM version into x86 code.
A good suggestion, not only to adopt our library, is to run debugging application on real devices.
Another way should be the adoption o a virtualized x86 Android environment: in that case will be adopted the x86 native library.