Hello

Arround 450 video
And the VIDEO PRODUCER have to be rework totaly

In my case :
- ITs lagy (the engin have to charge the 450 video before i can work in the section
(So why i was impact when i want work or edit my new 2020 video by the past 2015 video ... charging, lagging, and wasting my time because the page was unusable at this tile
- Unusable time charging all video ...
- when you want organise its too slow, and unusable because you have to drag and drop ... and the memory cant follow your content faster / Same when you want edit a collectiow with many video !

Bref

This page is totaly unusable, unworking correctly, and not web 2020 app services acceptable

if you cant optimise your engine or your code, please rework and design a new way to use the last video content ...

Its a Design and App architecture trouble
Certainly a code and programming trouble
Certainly a Architecture technologie trouble
Please check the Google youtube infrastructure you are at light years away from them and the new Web APP