How to Fix: Site Health good

Site Health good is an important check in the WordPress Specific category, and a high-priority one. WordPress ships its own Site Health tool, and this check asks a simple question: is it green? A site sitting on failing Site Health items is usually one carrying quiet performance and security debt that eventually surfaces as slow pages, broken features, or a crawl the search engines start to distrust.

What This Check Is Really About

Since WordPress 5.2, core includes Tools → Site Health, which runs a battery of tests and grades them as critical, recommended, or passed. This check verifies your site has no critical issues and few recommended ones. Site Health is not an SEO tool per se, but its failures — an outdated PHP version, a missing loopback request, no persistent object cache, inactive auto-updates, an unreachable REST API — map almost one to one onto the things that slow a site down or make it flaky to crawl.

Treat the Site Health screen as the honest baseline for the platform underneath your content. You can write perfect titles all day, but if the REST API is failing loopback requests or the site is on an EOL PHP version, you are optimising the paint on a car with a misfiring engine.

Why It Matters for SEO

• Outdated PHP and missing caching are direct, measurable hits to page speed and Core Web Vitals
• A failing REST API or loopback breaks the block editor, scheduled posts, and features crawlers and tools rely on
• Inactive updates and unsupported components are the leading cause of the security incidents that get sites deindexed
• A green Site Health is the cheapest proof to yourself that the foundation is sound before you chase rankings

How to Check It

1. Go to Tools → Site Health → Status and read the critical and recommended lists top to bottom.
2. Open Site Health → Info to confirm the actual PHP version, memory limit, and server details — the numbers behind the grades.
3. Cross-check against Google Search Console: if Site Health flags performance items, Core Web Vitals in Search Console usually confirms the real-world impact.
4. Run the SEO Roadmap audit to see which Site Health failures overlap with issues it is tracking elsewhere.

How to Fix This in WordPress

Difficulty Level: MEDIUM – This fix requires some technical knowledge or familiarity with WordPress settings and plugins.

Estimated Time: varies

Work the critical items first, then the recommended ones. Here is the order I would take them in, because it front-loads the fixes with the biggest return.

Step 1: Update PHP

If Site Health flags an outdated PHP version, this is almost always the highest-value fix on the page. Take a backup, test on staging if you can, then update PHP in your host’s control panel to a currently supported release. Newer PHP is faster and safer, full stop. Most “mysteriously slow WordPress” cases I am handed start here.

Step 2: Restore the REST API and loopback

A failing REST API or loopback request usually traces to a security plugin, a firewall rule, or a misconfigured server blocking WordPress from calling itself. Temporarily relax the suspect rule, re-run the test, and fix the rule properly once you have found the culprit. Do not ignore this one — it silently breaks the editor and scheduled publishing.

Step 3: Add persistent object caching where it helps

If Site Health recommends a persistent object cache, and your host offers Redis or Memcached, enabling it can noticeably cut database load on dynamic sites. This is a recommended, not a critical, item — apply judgement. On a small brochure site it changes little; on a busy WooCommerce store it matters.

Step 4: Clear the recommended list deliberately

Enable automatic background updates, remove inactive themes and plugins, and confirm HTTPS is fully in place. You do not need every recommended item green to be healthy, but you should be able to explain each one you leave open. “I read it and chose to skip it” is fine; “I never looked” is not.

Verify the fix

1. Clear your caching plugin so tests do not read stale state.
2. Reload Site Health and confirm the critical list is empty.
3. Re-run the SEO Roadmap audit, then watch Core Web Vitals in Search Console over the next few weeks for the downstream improvement.

Recommended Tools & Plugins

These tools can help you fix and prevent this issue:

• Yoast SEO – Comprehensive SEO plugin with built-in checks
• Rank Math – Feature-rich SEO plugin with detailed analysis
• Google Search Console – Free tool to monitor your site’s search presence
• SEO Roadmap – Complete SEO audit and action plan tool

Common Mistakes to Avoid

• Chasing a perfect green score by silencing recommended items instead of understanding them
• Updating PHP straight on production with no backup and no staging pass
• Disabling a security plugin to fix the REST API and then forgetting to reconfigure it properly
• Enabling an object cache the host does not actually support and creating new errors
• Treating Site Health as cosmetic when its failures are the root cause of the speed problems you are blaming on your theme

Need More Help?

If a Site Health item refuses to clear, the answer usually lives at the server level — PHP configuration, a firewall, or a host limitation — rather than inside WordPress. That is the point to bring in your host’s support or a developer with server access. Run a full SEO Roadmap audit alongside it so you can see which Site Health failures are actually moving your rankings and prioritise accordingly.

This guide is part of the SEO Roadmap knowledge base – your complete resource for WordPress SEO optimization.