SP CO-OP not WORKING
 

ok im not talkin bout the omaha coop mod
im talkin about THIS http://www.alliedassault.com/community/guides/eascya/

eascya says that shood work
but when i make a dm game and wait for my friend to join
and then type maplist and find a sp map and switch to it everything is fine untill he joins
it gets all CHOPPY, not latency wise but like 0.4 FPS, even tho normall i get liek 100FPS in normal games, and same for him too

why does it do this? we even tried it on a LAN!