By default in MySQL 5.6, each time MySQL is started (regular start or crash recovery), it iterates through all the binlog files when GTIDs are not enabled. This can take a very long time if you have a large number of binary log files. MySQL and Percona Server 5.6.21+ have a fix with the simplified-binlog-gtid-recovery [&]

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http://www.percona.com/blog/2014/12/01/faster-restarts-for-mysql-and-percona-server-5-6-21/