High CPU Load Average

Hey guys!
I have an ASTPP 4.0.1 Comunnity, installed on a server with 8cpu and 16G of memory, we have an approximate traffic of 90 simultaneous calls, however we are facing problems of high processing load. We have peak hitting load of 15 … 14 …
The question, does this server configuration need more cpu? or is there a problem?
OS: Debian 10 Buster

i have running version 3.5 up to 300 simultaneously cannel’s Under US CC traffic hitting the server wit 40 CPS with 8 CPU and 16 G and all worked fine → i try to push the same traffic to a server 4.0.1 and it crash

You may do optimization in MySQL and Freeswitch.