Upgrade VPS CWP7Pro to PHP v8.3 and Nginx + PHP‑FPM

Upgrade VPS using CWP7Pro to PHP v8.3 and Nginx + PHP‑FPM 8.3 and make performance inhancements.

GZIP / Brotli Compression & HTTP/2

Enable compression of HTML/CSS/JS at the web‑server level (Nginx’s gzip on; or Brotli).

Turn on HTTP/2 and HTTP/3 if supported for multiplexing and reduced latency.
PHP‑FPM Pool Sizing (/etc/php-fpm.d/www.conf)

Decide how much RAM to reserve for PHP‑FPM (8 GB). Measure average memory per FPM child:
Redis Object Cache
OS Virtual Memory & File Limits (/etc/sysctl.conf)

Tweak swap behavior & dirty writes:

vm.swappiness = 10
vm.dirty_ratio = 15
vm.dirty_background_ratio = 5
fs.file-max = 2097152
Then sysctl -p.

Also raise ulimits for web server/PHP i.e.:

# /etc/security/limits.conf
nginx soft nofile 100000
nginx hard nofile 200000
php-fpm soft nofile 100000

Nginx Worker Processes (/etc/nginx/nginx.conf)
Match workers to CPU cores (8 cores) and allow many connections:
improve SMTP on camelott-it.co.uk

Check for errors and fix before Monday.