Many slow queries post_type = ‘attachment’;

This is bug #31071: media / post_mime_type related queries are very slow on larger sites. It should have been fixed for version 4.8 now.

You can try it on a test site that is a mirror of your production site. There are some very interesting ideas in that bug discussion. See if you can use some of them right now already, like adding an index.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)