WordPress System Optimization & DNS Adjustment

My WordPress site is experiencing significant performance issues. The backend is slow, and the frontend is not much better. My site has around 30,000 subpages, with more being added regularly. It's critical for the overall stability of the site to be optimized for speed and efficiency.

Key Areas of Focus:
- Frontend Optimization: This includes reducing the page load time, ensuring that elements render without flickering, and tweaking the site for improved Google rankings.
- Backend Optimization: I need help with database optimization, server configuration, and managing my plugins effectively.
- DNS Adjustment: My email is currently non-functional due to DNS issues, which need to be resolved.

The system is currently custom-built and operates with WP Rocket, Cloudflare, and Plesk. I need all these components adjusted for optimal performance. The ultimate goal is to have the pages run smoothly and quickly without any visual disruptions.

Ideal skills for this job include:
- Extensive experience with WordPress and its backend.
- Proficient in database optimization and server configuration.
- Familiarity with WP Rocket, Cloudflare, and Plesk.
- Knowledgeable in SEO and Google ranking factors.
- Skilled in DNS management.

Please let me know if you require any further details or adjustments to this project description.