Apple has just released iTunes 10.5 Beta 9 to developers. The update is said to offer several performance enhancements for those developers subscribed to iTunes Match beta, according to our anonymous developer sources.

Developers are being reminded that iCloud libraries will be deleted at the end of this beta.

Apple states, according to the iTunes 10.5 Beta 9 Release Notes:

Backup regularly and do not delete the music you add to iCloud from your computer. Apple may periodically delete all iCloud libraries during the beta period. This will require you to scan, match, and upload songs again. Also note that some of the features and optimizations of iTunes Match may not be available during this beta.

Apple is expected to release its iTunes Match service along with iOS 5 very soon. The service allows users to backup and maintain their entire iTunes music library via iCloud for a yearly fee of $24.99.