I have a very simple game app set at 60 fps and it runs very well on my Samsung Galaxy Nexus phone.
I recently added the admob plugin and required the corona ads library on my scene and noticed a few performance issues.
1) When the ad is initially requested, fps drops to 0 for 2 - 3 seconds
2) When the ad cycles (i.e. for a text ad it slides to the next text) it causes a noticeable frame rate drop which negatively affects the game play. Since admob ads cycle every couple seconds it is a big problem.
Have you all looked into the performance implications of your implementation of admob? What can I do to stop the frame rate drops?