I have an 8130 also and it's been seriously lagging the past 2 days . I'm thinking it might be an app I installed because it was fine before that . I'd boot the app but it cost me $30 .....so if that's the problem then the company will be hearing from me .
Nitesamba, if you really want to cure the problem I would;
Strip away all of the installed applications - Check phone for lag, if no lag then re-install the apps one at a time, testing for lag after each install. It could be a specific application causing the lag.
If you have restored the phone to a base configuration and it's still lagging then consider a hard reset.