What's the problem will be habbened if my game is later than 20MB

"games larger than 20mb may exhibit performance issues in gamesalad acrade. consider reducing this project's size before publishing your game to arcade."
Basically, an IOS game is hundreds of MB, so what's the problem will be happened if my game is lager than 20MB, and wha's the worst issues?
Basically, an IOS game is hundreds of MB, so what's the problem will be happened if my game is lager than 20MB, and wha's the worst issues?
Comments
By the way.
Is there any problems on GS when my game is lager than 20MB?
'cause it said "may exhibit performance issues ", GS will be slower? or other issues?
Send and Receive Data using your own Server Tutorial! | Vote for A Long Way Home on Steam Greenlight! | Ten Years Left