Optimize WordPress Query that take 5 seconds to execute

I had the exact same issue. The problem is not one that can be fixed without modifying some code that you probably shouldn’t (or perhaps writing a filter or a ‘drop-in’). The issue is the CAST directive in the SQL statement. It CASTS the entire table before it does anything, with the amount of records you have, its going to take a while.

Capture the query, remove the following "AND CAST(mt1.meta_value AS CHAR) = 'deleted'" and run it, it should be a lot quicker now.

Edit: (Correction) change the query to "AND mt1.meta_value="deleted""

I have no idea what the developers were thinking when they added that useless CAST, with MySQL it works fine without it (TEXT is no different than CHAR except the size). I am sure there are some edge cases where removing it will not give the desired results, but I have yet to find one.

Long live WordPress SQL X)

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