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Emulation is always inefficient and requires much more processing power than the system being emulated. Emulation always takes more CPU cycles than it does running natively (on actual hardware). Most computers out there do not have the power to run a cycle-accurate emulator at full speed with all of the effects and features of the DS. As time goes on, computers will get faster, and the emulators will become slightly more efficient, but it is unlikely that your current computer will ever be capable of playing all DS games at full speed.

^^ You do realize every console system was made from yesterdays computer hardware at the time of each console gen's release. The only real differences between them are: Each console's OS no matter how primitive it was written to run their processors fully loaded with the majority of game data cached in RAM. The DS runs an ARM 9 & ARM 7 Processor. However, most of the DS emulators are old and have not been updated. Also unlike console OS's most emulators were not written to utilize all cores on a processor (I think it was just something most developers had overlooked). Windows, Linux, Mac, etc...etc...etc...will never try and force an emulator to utilize all it's cores, if the emulator was not already written to utilize all available cores. Unlike modern console/handheld processor instructions that always force workload division.

Back to the original question though, No$GBA (Yes it says GBA, but it does have DS support). This is the only DS emulator I have seen that is multi-thread written. And when set up properly it can also run DS games smoothly even at faster speeds than the game was intended to be played at. You can YouTube it, plenty of DS vids on No$GBA. But simply because of the fact that it was written to utilize all available cores, much like the console OS, it can run well on hardware even older than the DS device itself, such as a Socket 478 Pentium 4 with Hyper Threading. Emulator performance comes down about to about 90% programming but only about 10% hardware.

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Q: Why are Nintendo DS emulators so slow?
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