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The introduction of just-in-time (JIT) compilation in Android 2.2 delivers a very significant performance boost and dramatically increases execution speed.

Android 2.2 is, at heart, a point upgrade. However, it's a very capable upgrade, and one that other companies would have treated as a jump from x.1 to x.5. New enterprise features make it a worthy successor to Windows Mobile as a business OS, and improved performance gives it a significant boost.

Android 2.2 is the first version of Android that feels totally complete—it performs like it should and it has most of the features it should ... It's safe to say that with Froyo, Android has become something that most people really can use—and love.

Android 2.2 delivers a mix of minor and major improvements. Some – like installing apps to SD – are long overdue...Others are far more important. Better Exchange support means more businesses will be interested in Android. Better performance is particularly welcome.

All of the changes in the free Android 2.2 were positive ones, and none of them added any noticeable issues to the system. In fact, our in-house Nexus One felt faster in every respect post-update. Android has taken a huge leap with 2.2.