How to speed up WooCommerce search

If the search box lags, or the server slows when many people search at once, the cause is nearly always the same: every keystroke sends a request that queries your database.

What makes search slow

The default search asks the database to scan product text with a wildcard match. That is fine for 200 products and painful for 20,000. Live search plugins that call the server on every keystroke multiply the load, and a busy sale day multiplies it again.

Fix 1: do not search on every keystroke

Wait a moment after the last key before sending a request. Cut the number of requests and the box feels the same to the shopper.

Fix 2: search a prepared index

Instead of querying your product tables live, build a small search file ahead of time and search that. The query becomes a lookup in a file, not a database scan.

Fix 3: search in the browser

If the index is small enough, the visitor's browser can load it once and search locally. Typing then costs your server nothing. A web worker keeps the page smooth while it searches.

Fix 4: do not load it until needed

A search script that loads on every page slows every page. Load the app on the first click or focus in the search box. Before that, a tiny inline script is enough.

Keep rebuilds off the shopper's path

Rebuild the index in the background, one at a time, and never when a visitor happens to arrive. Product saves should never be blocked by the search.

How Lodestar Search does it

Lodestar Search follows the last three fixes. Before anyone uses a search box it adds one 1.2 KB inline script and makes no request. The first click loads the app, and parsing and searching run in a web worker. Index files are cached for a year under versioned names. Rebuilds run in the background with a lock and a time limit. Get the free plugin.

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