need help with DS emulator

i downloaded the assassins creed game for DS, and been trying to find an emulator that can run it without lag. the only one i found without lag is the no$GBA, but it cant read the game data after i chose language.anyone know a better emulator for DS games?

there is no better emulator than No$GBA, unfortunately.

The lag is always there but still, its depending on the memory and speed of your Pc.