- Disable wp-cron.php and enable real cron job and process.
- Disable xmlrpc.php because since api hosting is not allowed here.
- Use WP-Rocket or other optimizing plugin(be sure to chose the right one)
- Optimize manually the images (dont use php scripts, or any plugin)
- Use minimal, less resource theme. (Astra, Disto, is best and etc).
- Consider HTTPS .
- Use CloudFlare CDN
- Cache is essential
- Dont use cookie based resources.
- Lazy load the fonts
- Lazy load images
- Minimize all scripts at their maximum.
- Remove unused plugins.
- Minimize the usage of HeartBeat API
- Dont use analytical plugin.
May these help you