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→Timing issues
===Timing issues===
One of the biggest remaining problems in N64 emulation is the lack of accurate core timings, which , in practice, means games don't always run at the speed they would on real hardware. While this technically affects all games, the majority are only affected to a negligible degree. In some instances (particularly in Rare games) this can actually result in fewer framerate drops and lag, which can be seen as beneficial. However, some game engines actually depend on accurate timings for proper game behavior, and not emulating them properly can result in considerable to major issues. Some notable examples include the following:
* Intros and cutscenes playing too fast and not correctly syncing up with musical cues. Seen in Goldeneye's intro and Body Harvest's beginning cutscene.
* Gameplay demos running at hyper speeds. Earthworm Jim 3D is most notorious for this, though the main game itself is largely unaffected.
* Game physics not working properly due to being tied to framerate. A good example is Donkey Kong 64, which is programmed to boost the character's speed and momentum proportional to in-game lag (most likely to make up for the game's frequent framerate drops), which can be exploited for certain glitches and sequence breaks on real hardware. Emulators currently run the game too well and with too little lag, making most of these tricks impossible to pull off.
* Possibly the most affected game is Knife's Edge, which runs like it's on permanent fast-forward, making it all but unplayable. Messing with timing-related settings such as CounterFactor can mitigate this somewhat, but nowhere near enough to fix the issue.
Fortunately, tackling these problems has recently become a core focus of development in some N64 emulators, and attempts are underway to improve the situation. [[ares]] currently has the most accurate timings overall and already runs Earthworm Jim 3D's demos much better than other emulators. Meanwhile, [[simple64]] has recently pushed various timing-related commits aimed at improving accuracy, and as a result, it may now be the only emulator that runs Donkey Kong 64 properly. As these efforts progress, it should be noted that a side-effect of improved timings may be greater in-game lag. This shouldn't be seen as the emulator becoming slower, but rather as the emulator behaving exactly like the real hardware does, as many N64 games were notorious for framerate drops.
For more information about Nintendo 64 hardware and reverse engineering;
