Hold the table prefix to “ps_”, Except you already have a prestashop installation on the exact same database with the exact same prefix. In that scenario, It's also wise to unselect the option “Fall present table”. Right after it’s deleted, go back for your back office and refresh the page. https://www.presta-addons-modules.com/es/seo/prestashop-gtmetrix-speed-test-api-integration-module.html