Yes, that is the version.
1. you could upgrade the OS. Latest OS: 8300 188.8.131.52 / 184.108.40.206 (MultiLanguage)
2. As jmwking asked, if you are running any applications in the background (click Alt + Espcape) those can slow the device down also. Your call log, BBMessenger, Messages, Browser will always run in the background. Make certain your Browser is not on an active webpage.