Saw this term popping up a lot on Unity Profiler: Graphics.PresentAndSync which was hiking up my GPU.
Solved it by:
1. Changing the V Sync Count in Quality Setting to Don't Sync.
2. Changing the Graphics Level ( in Player Settings > Other Settings ) to Force Open GL ES 2.0 ( instead of Automatic ).
3. Disable any sprites in scene whose alpha is 0.