Optimization to avoid jitters on cardboard app whe

问题:

I am working on a cardboard application for android platform. Currently I have Light-maps, heavy textures and around 100 UI elements in scene (most of them have text components with stock Arial font from Unity3D standard assets and few ScrollRect and Mask components). Running application on cardboard in a bit jittery overall when I move head to look around in the scene and shows spikes on Profiler when I load a new menu. Profiler view from a frame is shown in the image below :

Has anyone faced this issue before?

Can someone point me to right direction of optimization?

Thanks in advance.