Same problem as other people, my sites are now painfully slow on the backend after the 6.4 upgrade, getting the error below on a Plesk Server.
When testing the REST API, an error was encountered:REST API Endpoint: https://www.mysafetygear.uk/wp-json/wp/v2/types/post?context=edit
REST API Response: (http_request_failed) cURL error 28: Operation timed out after 10001 milliseconds with 452 out of 2274 bytes received
Any guidance would be a massive help at this point.
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