Recommendation for mobile testing device

Hello!

I am currently using an Xperia MK16i cell phone with Android 2.3.4.

My application runs really slow. That led me to the question whether I am actually developing for a commonly used device or if my device is just too old.

Is my device fine, and I should tweak my application, or should I concentrate on people with a newer, more capable device?

Try your game on other device to make sure your game is running good or its slow