Android : Slow GPS Updates

I am developing a small app that works as a speedometer with a build in histogram.

But it is quite unresponsive, I test it by driving in my car, and when i go from 80 to 0 it takes about 4-6 seconds before my needle is updated.

For simple outlier removal, i use a 1x3 median filter on my estimated speed the speed. Wich obviously will give me a delay one 1 sample.

******* Here's the real question :) ****** I thought i might get updates every second, and thus a delay of 2 seconds, wich wouldn't be to bad. but is GPS really that slow? or am i doing something completely wrong? *******

I have registrered a listener like so:

CODE:..............

To have a steady update of my speedometer, I use a timerTask to poll the listener for the last estimated result, and updates my speedometer view.

CODE:............

And the run method of my task:

CODE:.....................