Use a custom table for a view counter. This is faster, easier to write, and it has fewer side-effects. Post meta queries are rather slow. The information is stored in a way optimized for average post handling, not for custom sorting or many write accesses. Also, all post meta values are fetched each time someone … Read more
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You would probably be best of writing your own SQL query, for performance-reasons. Another option is to store the mileage separately in a custom field for each user. As for writing your own SQL query: you could query all users, then join their posts, then join the postmeta-table. After that, you can use the SQL … Read more
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