Increasing TALK's efficiency?

I have a server on a 100/100Mbit link
The server currently has 4 cores i3 3Ghz, 6GB RAM

Installation of Nextcloud with STUN server via tcp port

Up to 6-7 users even work. But above, problems begin.

Observing the load I see that the STUN server takes almost the whole cores.

Is there any way to increase the performance on one server or am I forced to use a streaming server like Janus?
My target number is 14 users.
Can installing Janus reduce STUN consumption?

You can try:

Welcome to the Nextcloud Community @cyryllo