Optimize 2D menu game by disabled raycast target

Questions & Answers
1

Hello,

I am making a 2D game with many menu page (50) in the same scene. I only activate menu page at once and popup, footer and header.

But I noticed slow down on Android. I wonder if disabled all raycast target (in UI Image) that are not usefull will help to optimize?

I work with Unity 5.2. I have many sprites using sprite packer with default compression activated.

2

I have tested with profiler and noticed that event system script is the bottleneck. When I desactivate EventSystem object(more precisely Event System script), then fps is 100.