Seems if you are sitting on kernel 4.19+ it gets easier to gather/display much needed stats as there are better/improved/newer tools available.
One of those is pretty easy to install:
apt-get install bpfcc-tools python3-bpfcc
and to use:
cpudist-bpfcc -p `pidof suricata` 600 1
This would basically show all usec done by Suricata for the 10min period
It can also be done per thread which can come very handy in troubleshooting:
cpudist-bpfcc -L -p `pidof suricata` 600 1
This (screenshot attached) is what I noticed on a heavily tested machine inside a peak of 10min. Wondering out of curiosity what everyone else is seeing . Runing 6.0.0-dev (26123e05f 2020-03-20) with AFPv3, 40 threads, 4.19 kernel.