Well the "Lagging" part there's nothing that can be done about that :p 2 wows is a strain on the PC.

As for Mac-specificness, there's a program called Clonekeys that basically works like Keyclone/Octopus/etc for Mac users; I don't have a specific link but there should be a Sticky for it in the Software forum, or info on the Wiki about it :p

And my personal opinion is to lose the silly Fisher Price computer and get a real PC ;)