About JIT and native application performance:

Common on, friends. The "faster" feeling of Android devices is not because of that or optimized/non-optimized GPU. It comes because much more simple Android structure - the number of server applications is minimized, even inter process communication is done in kernel instead of a separate dbus.

For now it is OK, but with faster CPUs it needs to be changed and it will be changed. Maemo/MeeGo/Traditional Linux architecture is good starting from some CPU performance level. The selection of 600MHz CPU in N900 was not a good choice on this background.