Speed Test fine, but Youtube experience is bad in 4G

Hi Experts.
An issue observe on field:
In 4G the speed test is good, but youtube experience is very bad.
Multiple mobile have the situation.
Sites are stable and carring traffic.
What is main cause?

Is it on one site or whole area disturbed?

Whole area disturbed.

Have you checked by changing mobile?
Also, have you checked from app and HTTP both?
Are you facing issue on both end?

Open Chrome and try with youtube.com
Also try deleting Youtube APP and reinstalling it.

You could try doing a ping test to YouTube. Also, you may try to browse YouTube using a VPN and check it from there.

Multiple mobile on the same area having same issue…using app.

Whether any streaming class priority issue?

It’s defined in Core end.