Is it normal for WooCommerce AJAX functionality to slow down or even stop working?

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Posted on December 31 at 3:37 PM

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Recently, I've been maintaining a WordPress + WooCommerce e-commerce site. The site has been live for some time and receives a fair amount of traffic.

To improve speed, the following optimizations have been implemented:

Enabled page caching (WP Rocket / LiteSpeed Cache, etc.)
Enabled object caching
The frontend uses AJAX (e.g., product filtering, loading more items, adding to cart).

The problems gradually began to surface:

AJAX filtering sometimes responds slowly.
In some cases, clicking the filter button does not respond.
The same page loads normally on the first visit but noticeably slower on the second.
Disabling the cache alleviates the issue, but slows down performance.

What's currently perplexing is:
👉 Does WooCommerce's AJAX functionality inherently conflict with caching mechanisms?
👉 Is this a cache configuration issue, or a limitation of WooCommerce itself?

I'd like to ask everyone:

How do you typically balance "performance optimization" and "AJAX working properly"?
Is it necessary to exclude certain AJAX URLs from caching individually?
Are there any cache settings that appear safe but actually affect WooCommerce behavior?

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- yyuif0
  That's not right.
  December 31, 4:00 PMreturn (to a previous condition)
  report (malefactors to the police)
- Niu Kulu Zhenhuan0
  This is a very common scenario, and it's generally not an issue with WooCommerce or the theme itself. To put it simply: WooCommerce's AJAX functionality itself is fine; the problem usually lies in the cache configuration. Key points for quick troubleshooting: Caching plugins that fail to exclude ?wc-ajax= or admin-ajax.php can easily cause filtering, adding to cart, and other AJAX actions to slow down or fail. Many caching rules only exclude cart/checkout, but actual AJAX requests are still being cached. The "first time works fine, then slows down" pattern is typically how caching manifests after it takes effect. Practical recommendations: - Exclude all WooCommerce AJAX requests - Do not cache URLs containing filter parameters - Keep list page caching active, but disable caching for filtered results If disabling caching resolves the issue, it strongly indicates a caching strategy problem, not a WooCommerce limitation.
  December 31, 15:38return (to a previous condition)
  report (malefactors to the police)