I have read your requirements, i am an experienced Wordpress developer and expert Wordpress website speed optimization, I can get score of 85+ to 90 btw with average loading time of 3s to 2s on gtmetrix or google page speed insights or pingdom tool,
I can help you for optimize our website speed.
and speed up our website by optimizing codes.
We are going to do these all work for the speed-up of our website.
1. Leverage browser caching
2. Defer parsing of JavaScript
3. Enable gzip compression
4. Minimize request size
5. Serve resources from a consistent URL
6. Avoid bad requests
7. Minimize redirects
8. Optimize the order of styles and scripts
9. Minify JavaScript
10. Serve scaled images
11. Optimize images
12. Specify a Vary: Accept-Encoding header
13. Add Expires headers
14. Make fewer HTTP requests
15. Compress components with gzip
16. Use a Content Delivery Network (CDN)
17. Use cookie-free domains
18. Reduce DNS lookups
19. Minify JavaScript and CSS
20. Avoid HTTP 404 (Not Found) error
please feel free to contact me anytime, quality work is granted.
Thanks,
Rustam Ali