Kiedy wykonuję to zapytanie w ten sposób, zajmują one tyle czasu na wykonanie, ponieważ tabela user_fans zawieradziesięć tysięcy wpisy użytkowników. Jak mogę to zoptymalizować?

Pytanie

<code>SELECT uf.`user_name`,uf.`user_id`,
@post                := (SELECT COUNT(*) FROM post WHERE user_id = uf.`user_id`) AS post,
@post_comment_likes  := (SELECT COUNT(*) FROM post_comment_likes WHERE user_id = uf.`user_id`) AS post_comment_likes,
@post_comments       := (SELECT COUNT(*) FROM post_comments WHERE user_id = uf.`user_id`) AS post_comments,
@post_likes          := (SELECT COUNT(*) FROM post_likes WHERE user_id = uf.`user_id`) AS post_likes,

(@post+@post_comments) AS `sum_post`,
(@post_likes+@post_comment_likes) AS `sum_like`, 
((@post+@post_comments)*10) AS `post_cal`,      
((@post_likes+@post_comment_likes)*5) AS `like_cal`,
((@post*10)+(@post_comments*10)+(@post_likes*5)+(@post_comment_likes*5)) AS `total`  
FROM  `user_fans` uf  ORDER BY `total` DESC lIMIT 20
</code>