Is the server running slowly?

Question

Nginx

Good day, yesterday I set up the server and my joy knew no bounds, but the transition through the pages is not always carried out quickly, that is, sometimes at lightning speed, and sometimes well, right for 40 seconds. I suspect that the problem is in uwsgi, since it always returns statics quickly and without questions. The server itself, although with a minimal configuration, still has gunpowder:

The second picture shows that sometimes everything works quickly, sometimes slowly.
uwsgi.ini

#mysite_uwsgi.ini file
[uwsgi]

# Django-related settings
# the base directory (full path)
chdir           = /data/mysite/project
# Django's wsgi file
wsgi-file       = /data/mysite/project/mysite/wsgi.py
# the virtualenv (full path)
home            = /data/mysite/venv/mysite

# process-related settings
# master
master          = True
# maximum number of worker processes
processes       = 10
# the socket
socket          = /tmp/mysite.sock
# ... with appropriate permissions - may be needed
chmod-socket    = 666
# clear environment on exit
vacuum          = true
# account to start process
uid             = root
gid             = root
# Output messages to log
daemonize=/var/log/uwsgi/mysite.log

Answer 1

what is this: /var/log/uwsgi/mysite.log ?
and this, is it necessary to run the workers under root? it's a bit unsafe...