i suggested wavesecure for my bro for his e65.
that app. heavily slowed his mobile.
it'd take a minute to go into contacts; messaging will take 2-3mins; other apps. used to take more time.
he installed it after updating firmaware, so at first we hought the f/w fooked the phone, but later told to him to uninstall wavesecure (troubleshooting

)
the phone got its speed back.
wavesecure was running as hidden app., maybe the phone's proc. is not powerful enough to run it in background.
on n97, i have no prob. with wavesec.