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My website is slow and I got some queries like this

 

Query Time (ms) Rows Filesort Group By Location SELECT SQL_NO_CACHE c.`name`, cl.`id_lang`, IF(cl.`id_lang` IS NULL, c.`value`, cl.`value`) AS value, c.id_shop_group, c.id_shop
FROM `ps_configuration` c
LEFT JOIN `ps_configuration_lang` cl ON (c.`id_configuration` = cl.`id_configuration`)

Can someone explain me (in a detailed manner as it's the first time I'm doing this) how to solve this? 

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