Nginx FastCGI Cache Outperforms WordPress Plugins for WooCommerce Traffic Spikes

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A development team migrated a production WooCommerce store from plugin-based page caching to Nginx FastCGI cache to better handle high-concurrency traffic. Unlike caching plugins such as WP Rocket or W3 Total Cache, which still consume PHP-FPM worker slots even when serving cached pages, Nginx FastCGI cache responds entirely at the web server layer without invoking PHP at all. This distinction matters little under low traffic but becomes critical during promotional spikes, where a limited PHP-FPM pool can cause queuing and site slowdowns. The team found that FastCGI cache reserves PHP capacity exclusively for dynamic requests like cart and checkout flows, significantly improving scalability. However, the migration also introduced real-world complications, particularly around cookie-based cache bypass logic tied to WooCommerce session and cart cookies.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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