The dashboard says pages are cached but not served the fast way
WP_CACHE is missing from wp-config.php. The plugin tries to add it, and on many hosts the file is deliberately read-only — which is good practice, not a fault.
Add this yourself, immediately below the opening <?php:
define( 'WP_CACHE', true );
It must be near the top. Below the "stop editing" comment is too late.
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