It hasn’t been too long since BlackBerry Messenger was officially updated to version 5.0.1.41, however, that doesn’t keep Research in Motion from working on improvements.  A leaked version of BlackBerry Messenger 5.0.1.45 has been found online and is said to have speed improvements.  BBM 5.0.1.45 is a leaked BlackBerry software, and, thus, officially unsupported, however, you can download it here if you decided to give it a go…