no way. over 3g, i can control my laptop just fine. when you open up a new window or close one is when you'll notice a slow down. otherwise it's as if you're right in front of your pc. i'll control my torrents and see their current download rates fluctuate and everything.
there isn't any sound though and video doesn't really play it just streams still images. i just wish my lappy had a built in webcam so that i could survey my room whenever i'm away.
as for the computer side, you'll need to set up a VNC server with TightVNC(recommended) and i also had to set up a server with no-ip.com, due to technical difficulties with the basic setup.
also i leave my laptop on 24/7. i don't think you can turn it on with Jaadu.
but there is a separate app just with that function. i think there's one called iWOL(wake on lan).
so i think a iWOL and Jaadu combo would work fine.