WordPress Site Performance Optimization

My WordPress site is experiencing performance issues and requires expert attention. I'm looking for a skilled WordPress developer to diagnose and fix the underlying problems.

Key tasks include:
- Identifying and resolving issues causing slow loading times, crashes, or high resource usage.
- Optimizing the site's speed and performance.
- Ensuring all plugins and themes are compatible and functioning correctly.

Ideal Skills and Experience:
- Proven experience with WordPress performance optimization.
- Strong knowledge of plugins, themes, and site architecture.
- Ability to troubleshoot and resolve complex issues.
- Familiarity with caching, CDN, and other optimization tools.

Please provide examples of similar work done and a brief outline of your approach.