I actually switched from PeekaWho to Aerize Email Alerts because it seems like the newer version of PeekaWho were really slowing down my 8820... Aerize seems to be somewhat better in this regard so far...
Yea, peekawho is just for email and sms, they have releases pretty often, and there have been reported problems with the most recent one, so they should have an update shortly if you dont want to pay for another app
I downloaded Peek A Who trial and it slowed my curve down to the point where it was almost useless. I hope smrtguard gets on this soon and fixes this problem.