Server-Side Caching for WordPress: Page Cache, Reverse Proxy and Object Cache
A practical overview of server-side caching layers and how to avoid redundant configurations.
Short answer: Server-side caching is a broad label. It can refer to full-page caching, reverse-proxy caches, opcode caches or persistent object caches. Each saves different work, so identify the layer before adding another plugin.
A host-provided full-page cache can overlap with plugin page caching.
Full-page caching
A host-provided full-page cache can overlap with plugin page caching.
Object caching targets repeated application/database work rather than replacing the whole rendered page.
- Change one important variable at a time.
- Compare repeatable behavior rather than one isolated score.
- Keep reliability and maintainability ahead of marginal benchmark gains.
Reverse proxies
Object caching targets repeated application/database work rather than replacing the whole rendered page.
Ask your host what is already active before layering additional caching software.
- Change one important variable at a time.
- Compare repeatable behavior rather than one isolated score.
- Keep reliability and maintainability ahead of marginal benchmark gains.
PHP opcode cache
Ask your host what is already active before layering additional caching software.
A host-provided full-page cache can overlap with plugin page caching.
- Identify which layer is caching the response.
- Prefer the narrowest safe purge instead of clearing every cache by default.
- Verify behavior while logged out or in a private browsing session when testing public page caching.
Persistent object cache
A host-provided full-page cache can overlap with plugin page caching.
Object caching targets repeated application/database work rather than replacing the whole rendered page.
- Identify which layer is caching the response.
- Prefer the narrowest safe purge instead of clearing every cache by default.
- Verify behavior while logged out or in a private browsing session when testing public page caching.
Managed-host caching
Object caching targets repeated application/database work rather than replacing the whole rendered page.
Ask your host what is already active before layering additional caching software.
- Change one important variable at a time.
- Compare repeatable behavior rather than one isolated score.
- Keep reliability and maintainability ahead of marginal benchmark gains.
Practical decision rule
Fix the layer the evidence points to. Caching helps repeated server work; CSS and JavaScript work affect rendering and responsiveness; images and fonts affect transfer and discovery; hosting and application behavior affect origin response. Avoid solving a different problem just because a tool is popular.
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