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Baffled with MySQL LEFT JOIN query that I have to speed it up

I am kind of a puzzled with this query trying to optimize it but no way I am able to (due to my limited knowledge as a DBA). So, I asked the experts. In my setup I have three (primary) tables. ...
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Hi I am running the most recent version of Percona Server. Server version: 5.5.24-55 Percona Server (GPL), Release 26.0 I have a 10 cpu box of these characteristics. processor : 0 vendor_id ...
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Percona vs MySQL

What is Percona? How does it differ from MySQL? When should we consider switching (or upgrading) from stock MySQL to Percona? To add some specifics in our situation we almost exclusively use ...