Reproduction steps:
1) Open users attached project, proceed to "MainScene" scene and build for android.
1.1) Note the fps value on the screen of a device or in the profiler.
2) Deactivate "10 - uGui Images" nested in canvas and activate "10 Sprites" in the hierarchy.
3) Build, run and compare fps results with previous.

Sprite Renderer Image (Script)
~49 fps ~39 fps Galaxy Tab3 Android 4.4.4
~57 fps ~18 fps Htc desire 510 Android 4.4.2
~50 - 40 fps ~21 fps LG G3 Android 5.0
Profiller

DUT:
Galaxy Tab3 Android 4.4.4 - Reproduced
Htc desire 510 Android 4.4.3 - Reproduced
LG G3(LG-D855) Android 5.0 - Reproduced

Reproduced with: 5.3.3p1 , 5.3.1f1, 5.2.4f1
Does not reproduce with: 5.1.4f1