Can an app on your iphone make a multiplayer game lag?

I have Classic Doom for the Iphone, but the friggin' game lags when playing multiplayer and coop. It shows the wifi signal and after it lags, it just freezes with the signal showing. Could this be an app that I downloaded or something else? I badly want to play more multiplayer but this lag is annoying!
Restarting it doesn't work either :(
Neither does closing all the tabs in safari
 
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