[FPS Tweaking]Low fps on mobile portrait view

I’m developing an android game and I’m currently facing performance issues.

I’m using Adreno Profiler program from Qualcomm to plot FPS graph on Nexus 4 , I’ve got around 34 FPS on portrait view and around 44 FPS on Landscape view.

Is there any tweak that improves FPS on portrait view ?

Portrait view profiler:

Landscape view profiler:

EDIT: Ignore the huge FPS drop, it happens when restarting the level