We Both Have More than capable pc to run fm 15 , there is no problem to either one of us in the offline game so i dont think its about how goad the PC .
I opened an online game with several people and its the same with all of them and it doesnt matter who hosting the game , every match after you finish the team talk ( and even the way there from sumbit team is slow )
you have to wait at least a minute and maybe even two minutes until the game...