My Nintendo DS emulator for iPhone iOS is lagging?

Okay, so I watched a tutorial on Youtube. This guy showed how to install game emulators without being jailbroken. And his turned out fine. I followed the instructions and everything, but mine is running slow and is lagging, and it makes gameplay nearly impossible, unless you're patient lol. Please help me! Is there anything I can do to stop it lagging so much?

Its not strong anough to run ds games.

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