[FPS Tweaking]Low fps on mobile portrait view

Development Rendering
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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:

Portrait.PNG
Portrait.PNG1768×502 13.9 KB

Landscape view profiler:

Landscape.PNG
Landscape.PNG1819×470 14.1 KB

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