Threejs is dropping frame when scrolling on mobile

Hi guys,I am working on a project everything is good except on mobile when I scroll the page the framerate drops drastically, I am not sure why and it only happens on mobile.

https://webdesign-flash.ro/ht/pap/build/

The app is potentially fragment shader bound. For testing, can you see an improvement in performance if you disable post processing on mobile?

I tried to disable the post-processing but still the same issue, when scrolled and when the player gets in the viewport the scroll gets laggy and frame rate drops, I don’t understand why…

I have finished the product Plasmic Audio Player

Thank you for your help.