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This is highly dependant on the user, number of followers and the site's activity. ~19.4 seconds vs 0.001 seconds is a serious performance regression.
SQL:
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analyze is like explain but executes the query and reports back actual row counts.SQL:
Code:
set join_cache_level=2;
analyze
SELECT `xf_news_feed`.*, `xf_user_User_1`.*
FROM `xf_news_feed` FORCE INDEX (`event_date`)
LEFT JOIN `xf_user` AS `xf_user_User_1` ON (`xf_user_User_1`.`user_id` = `xf_news_feed`.`user_id`)
LEFT JOIN...Read more
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