WordPress Website Optimization

I'm experiencing some issues with my WordPress website. It has been manifesting slow loading speeds and multiple error messages have been popping up. Since these issues aren't specific to any particular page or section, it's clear that there's a need for an overall enhancement of the site's performance.

Here is what is needed:
- Increase the site's loading speed.
- Fix the existing error messages that have been frequently occurring.

Ideal Skills and Experience:
- Proficiency in WordPress.
- Website debugging expertise.
- A good understanding of website optimization techniques.