InnoDB Tablespace Duplicate Check Threads (and EBS Volumes for MySQL Startup with Many Tables)

In the last weeks / months, I have been working on understanding / improving MySQL startup with many tables. I already wrote five posts on the subject, they are listed below. In this post, I use the knowledge we gained in the previous two posts to show the interest of tuning InnoDB Tablespace Duplicate Check Threads, making startup 30% in one case (2:28 vs. 3:33) and 5% in