event.speed (GPS) higher refresh rate + display on while app is running

  1. Hello! I am currently programming a mobile app that uses the GPS of the phone to get the current speed while you are driving a car. (

But if you accelerate the GPS speed is lagging behind and my Question is if it is possible to get the refreshing rate higher? 

I really don’t know if this is possible or if the problem is the function or the phone ( Samsung Galaxy a5)…

  1. A second Question: is it possible that the display of the phone stays on all the time the app is running?

I hope you understood my question (and my English) and you can help me :slight_smile:

Thanks!