This is often related to your network traffic and that most of the time Ifind the kernel just uses a single core to send or receive via your NIC.
This can be adjusted like this so that multiple cores are used to send and receive data via your NIC (eth0).
multicore eth0 RX
#enable multicore
echo f > /sys/class/net/eth0/queues/rx-0/rps_cpus
# enable flow and entries cou........