How to Diagnose and Fix a Slow WooCommerce Checkout Page

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WooCommerce checkout pages are excluded from page caching by design, making them uniquely vulnerable to performance issues that standard caching plugins cannot address. Tools like Query Monitor can identify the root cause by revealing total query counts, query times, and the specific plugins responsible for excessive database calls. Common culprits include shipping plugins making live carrier API calls on every update, unnecessary cart fragment requests, synchronous calls by analytics and marketing plugins, and bloated autoloaded data left behind by old plugins. Installing an object cache solution such as Redis or Memcached can significantly reduce repeated database hits on these dynamic pages. If application-level fixes fail to improve checkout speed, the bottleneck likely lies at the hosting level, including PHP version, worker count, or shared server resources.

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