Speed up widgets back-end page and debug it

I have problem with very slow loading widget back-end page. And i have script error on load(every-time).
I know it is problem with too many active widgets(GK News and others).
Any idea how to hide/dont load all widgets on page open?

Hello,

Unfortunately the implementation of lazy loading of the widgets means a very complex custom work which is beyond of our technical support.

Hello,

Unfortunately the implementation of lazy loading of the widgets means a very complex custom work which is beyond of our technical support.

Ofc. I understand. I just ask about idea of the direction of solving the problem(from ur exp). If you have an idea that's good, if not that's fine too

I didn't implemented this kind of feature earlier and I didn't saw any plugin to do it.