my server info:

Processor Intel Xeon E3 1225v2
RAM 32GB DDR3
Disks 3 x 120 GB SSD

i run directadmin+nginx

the nginx use 14gb of 32gb and this output from server:

root 12872 0.0 38.8 12868180 12748776 ? Ss 09:35 0:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
nginx 12873 0.0 38.8 12889524 12759540 ? S 09:35 0:00 nginx: worker process
nginx 12882 0.0 38.8 12876504 12756964 ? S 09:35 0:00 nginx: worker process
nginx 12883 0.0 38.8 12879652 12757656 ? S 09:35 0:00 nginx: worker process
nginx 12884 0.0 38.8 12872432 12753532 ? S 09:35 0:00 nginx: worker process

when i do restart to nginx service it take 2min 40second to restart.
after restart it immediately use 14gb of ram

does it normal for nginx?