what makes an emu faster than the other ?

[cloud1250000]

It's all about choice. jpcsp didn't choose the good language first, java's too slow to be efficient in this kind of emulation (we are talking about ms and even smaller operation time).... Also, hle vs lle, hle tend to give better result in performance vs lle tend to give more accurate emulation but that's hitting the performance. The jit system is also very important, the more a jit is complete, the better the speedup will be (but then, there's still some cpu operation that's useless to jit).. Emulation hack is also an hard choice for emulator maker, usually they like accurate emulating and they ditch those kind of hack, but pcsx2 didn't have the choice to allow them since the ps2 is retarded and since they want to get good speed on lower specs computer. And then the OPTIMISATION begins... and dolphin and pcsx2 are much likely in those state now, there's always better coding method discovered while you're making an emulator, and your first code doesn't look like the one you just pushed (if you're working on it for years at least). It's all about going all over the old code, reformating and optimizing. Also, the graphic rendering backend can also be an important choice, dirextx is performing well on windows and it's more simple then opengl... while opengl is avalaible on multiple system and allow more advanced rendering stuff. If you can achieve something with two line vs 50 lines, they'll probably use the two line solution (and it should pay in much higher performance)


I think it's all about graphic backend, maturing in coding skill, jit, and dev choice (performance vs accurate, accurate exclude all form of hack)