Default [Q] Trainz Driver super laggy!!

Hello guys,
Thanks for looking at my thread... I installed "Trainz Driver" By N3VGames. I had watched videos of its gameplay on Galaxy Note 1, which were very smooth, and was sure that it would embrace my nexus 4 with great performance, but unfortunately, just the reverse happened...... The game is super laagggyyy... According to me, the frame rates wont be more than 20, thats not playable. Can u please check it and help me out? Adreno 320 is supposed to be a powerful GPU chip..... Thanks in advance!!
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Current Device:- LG Nexus 4 (16 GB) [[Running stock Android 4.3!! {{ UNROOTED}}]]