Does nds4ios work better if i jailbreak my iphone 4s?

I just downloaded nds4ios for my iphone 4s and its been very laggy on all of the games. I went into the settings and turned off the sound and turned on fps and when they are just talking like in platinum its 60 fps the second it goes to where i need to move around drops to 20 fps and then 10 fps when i'm trying to save. This app would be amazing just don't know how to fix the problem. Any advice would be helpful. Also if i do end up jailbreaking my iphone will that effect my multiplayer on Clash of Clans or will that be messed up once i jailbreak my phone?

I thought jailbrokon iphones is the only way to get emulators