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Google Map is laggy if i get user location on start

I am trying to display a Google Map on my Activity as a MapFragment and set a marker to my current location when the app starts. But if i do, the map loads badly and laggy.

The method i'm using to get the location is via locationManager.getLastKnownLocation()

What is the best way to do it so the map can run smoothly? It only happens with user location. If i set a marker with a hardcoded lat/long, the map runs nicely.

Thanks a lot. Henrique