i downloaded this prog and used it for about 4 hours last night, was fantasctic to know who was talking as i only know a couple of voices at the moment. there was a lot of lag last night, lots of rubber-banding and even a server crash. after a lot of complaints about the lag gator rebooted the server(i took this time to reboot my system) to try and fix the lag. the lag was gone for about 5 minutes, then i started noticing it coming back. i said something about it on ventrilo, someone else said it was probably bf2 bogging my system down(Athlon 64 3500+ OC'd to 2640mhz, 1GB pc4000 ram, ati x800 pro vid card, cable internet) which i didnt think was likely. after getting tired of the lag, i was going to finally call it a night, but just before i logged i noticed that my lag got worse when people spoke in ventrilo. i took a wild shot at the overlay program and turned it off. lag stopped immediately.
so, long story short, it can cause lag. ill wait and see if an updated version is released before i turn it back on.