KV Code Triggering the startup loading screen GUI of KOReader

Hi wonderful guys over mobile dear, I recently started tinkering the source code of KOReader on my machine and I came accross this beautiful loading animation (I really like the animation of the dots at the bottom of the screen.):rolleyes:

Is anyone aware which script is triggering this. I captured that animation while running KOReader on android. The gif is attached below:
Attachment 206663

Thanks for your time.

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