Too many records in locales_source table

Dear friends,

I have a strange situation in a website. The locales_source table have just 583.636 records and up (to 3000 posts). This situation give me a big problem with the response of the website that, at now, is too slow (sometimes the query in this table need 120 seconds to run).

In these records I have fields with the path of a post or comment but I don't understand why these records are created.

Someone have an ideia about it or just a light?

Thank you very much