Anything better than this for Xen under nginx?

Sure. No idea why though it uses MyISAM, probably not configured properly, because InnoDB is enabled by default (documentation says it).
If I would guess, it might related to this option in my.cnf : default_storage_engine = InnoDB where you have probably MyISAM.
Anyway, it won't hurt to try Percona, but just wanted to inform you can also keep MariaDB and changing some line in the config file.
Should be: default-storage-engine = InnoDB right?
 
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