Wordpress Plugin not working all of the time - takes long time to load

It's a page editor plugin and when I try to edit a page, it takes forever to load. It works fine on one page tho, but not on others and I don't think it's related to the content.

Any ideas what might be wrong?

---

I've tried disabling autoprotect so that's not it.
All other plugins except for this specific plugin is enabled. I'll try uninstalling as a last resort.

 

Error log is clean.
Anything specific I should be looking for in the access log?

I just searched for the plugin's brand name and it's stuff like HTTP/2.0" 200 907 or HTTP/2.0" 200 908.

Error logs were some of the first things I've checked. I saw that the max children limit was hit with 8 but I've adjusted it to 16 and haven't seen it say it's hit 16 yet.

Firewall & MariaDB all come up as blank.

Code (Text):

#x# HTTPS-DEFAULT
server {
 
  server_name domain.com www.domain.com;
  return 302 https://$server_name$request_uri;
}

server {
  listen 443 ssl http2;
  server_name domain.com www.domain.com;

  include /usr/local/nginx/conf/ssl/domain.com/domain.com.crt.key.conf;
  include /usr/local/nginx/conf/ssl_include.conf;

  # cloudflare authenticated origin pull cert community.centminmod.com/threads/13847/
  #ssl_client_certificate /usr/local/nginx/conf/ssl/cloudflare/domain.com/origin.crt;
  #ssl_verify_client on;
  http2_max_field_size 16k;
  http2_max_header_size 32k;
  # mozilla recommended
  ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS;
  ssl_prefer_server_ciphers   on;
  #add_header Alternate-Protocol  443:npn-spdy/3;

  # before enabling HSTS line below read centminmod.com/nginx_domain_dns_setup.html#hsts
  #add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
  #add_header X-Frame-Options SAMEORIGIN;
  #add_header X-Xss-Protection "1; mode=block" always;
  #add_header X-Content-Type-Options "nosniff" always;
  #add_header Referrer-Policy "strict-origin-when-cross-origin";
  #spdy_headers_comp 5;
  ssl_buffer_size 1369;
  ssl_session_tickets on;
 
  # enable ocsp stapling
  resolver 8.8.8.8 8.8.4.4 valid=10m;
  resolver_timeout 10s;
  ssl_stapling on;
  ssl_stapling_verify on;

# ngx_pagespeed & ngx_pagespeed handler
#include /usr/local/nginx/conf/pagespeed.conf;
#include /usr/local/nginx/conf/pagespeedhandler.conf;
#include /usr/local/nginx/conf/pagespeedstatslog.conf;

  # limit_conn limit_per_ip 16;
  # ssi  on;

  access_log /home/nginx/domains/domain.com/log/access.log combined buffer=256k flush=5m;
  error_log /home/nginx/domains/domain.com/log/error.log;

  include /usr/local/nginx/conf/autoprotect/domain.com/autoprotect-domain.com.conf;
  root /home/nginx/domains/domain.com/public;
  # uncomment cloudflare.conf include if using cloudflare for
  # server and/or vhost site
  #include /usr/local/nginx/conf/cloudflare.conf;
  include /usr/local/nginx/conf/503include-main.conf;

  location / {
  try_files $uri $uri/ /index.php?q=$request_uri;
  include /usr/local/nginx/conf/wpsecure.conf;
  include /usr/local/nginx/conf/wpnocache.conf;
  include /usr/local/nginx/conf/503include-only.conf;

# block common exploits, sql injections etc
#include /usr/local/nginx/conf/block.conf;

  # Enables directory listings when index file not found
  #autoindex  on;

  # Shows file listing times as local time
  #autoindex_localtime on;

  # Wordpress Permalinks example
  #try_files $uri $uri/ /index.php?q=$uri&$args;

  }

  location /test-site/ {
  try_files $uri $uri/ /test-site/index.php?q=$request_uri;
  include /usr/local/nginx/conf/wpsecure.conf;
  include /usr/local/nginx/conf/wpnocache.conf;

  auth_basic "Private";
  auth_basic_user_file /usr/local/nginx/conf/htpasswdtest;
}

  #include /usr/local/nginx/conf/pre-staticfiles-local-domain.com.conf;
  #include /usr/local/nginx/conf/pre-staticfiles-global.conf;
  #include /usr/local/nginx/conf/staticfiles.conf;
  include /usr/local/nginx/conf/php.conf;
 
  include /usr/local/nginx/conf/drop.conf;
  #include /usr/local/nginx/conf/errorpage.conf;
  include /usr/local/nginx/conf/vts_server.conf;
}

 

Damn, that worked.

What was wrong with the old one?