Delay and lag with casting

I have a delay and/or lag every time when a device casts to the projector.
Updating Netflix doesn’t work.
There is a delay between audio and video when using BT speaker.
Impossible to cast from Netflix on my phone.
any wireless connection brings delay…

HOW is this going to be fixed?

All of these issues have been discussed at length on the forum, please try to do a search for the relevant threads.

But whatever you do,

Never update Netflix yourself!