Snapdragon 810 low performance?

[spiwar]

I recently upgrade to the HTC One M9 from the Xperia Z1. The HTC device has the snapdragon 810 processor while the Z1 has S800.

My problem is why is the performance on the M9 so slow???

When I used my Z1, I can run Project Diva Extend with the 60fps hack at 1080p easily with some drops on a few songs.

The same situation cannot be said with the M9. It constantly drops under 60fps (mid 40s-50s) and since the game is tied to the framerate it is basically unplayable with the M9. I know it's not related to the overheating since I have modded my M9 and it stays relatively cool most of the time.

Does anyone know a solution to this problem? Or at least explain to me why this happens?