Blur (Optimized) Effect Has Very Slow Performance on Mobile Devices

I want to blur effect like Alto’s Adventure (3:13).

Blur (optimized) works very well on PC but it has very bad performance on mobile devices. How can i boost blur effect’s performance?

Use OnPreRender() and OnPostRender() instead of OnRenderImage() in BlurOptimized.cs as described here:

You should use profiler to check your memory usage when running in Unity, it could be your game’s optimization issue

Try Beautify’s blur. It has two performances modes and a transition option that goes from crisp image to extremely blurred effect.

It is still very slow on mobile devices. Are there any fix ?