The OpenGL and Vulkan renderers are currently buggy with runahead. First of all, in order for this core to work correctly with runahead, you should use the software renderer. There are currently some things you should know about Mednafen/Beetle PSX when it comes to runahead.Some of these cores include (but are not limited to) the Snes9x cores, QuickNES, FCEUmm, Nestopia, Gambatte, and even Mednafen/Beetle PSX. To this end, Dwedit has submitted several patches to some of the cores in order to make them perform much better. While the runahead system is core agnostic and therefore technically we don’t need to patch up cores in order to work with the runahead system, there are several things that can be done in order to improve performance considerably.The higher performance you get with a core, the more frames you can run ahead at fullspeed. These performance demands go up commensurate to the amount of frames you want to run ahead. For playable performance, your system should be at least capable of running the core at twice its regular speed.You can count the amount of lag frames a game has by using the frame advance feature in RetroArch. So, for example, if a game like Super Mario World for the SNES has a guaranteed 2 frame input lag, for the best results, set Runahead frames to 2. In order for the runahead system to perform as expected, you should set it to the same amount of frames to read ahead that the game you’re running is working by. Every game has a certain built-in amount of lag frames.Here are some basic things you should know: The versions that have this feature enabled and exposed now includes: Secondly, the feature has now been enabled for the vast majority of the RetroArch platform ports. First of all, several performance improvements have been made since. We ran an article on this new feature before, and since then, several facts have changed on the ground which bears pointing out. Well known people like Durante of DSfix fame praised it and the popular site Ars Technica has dedicated an entire article to this game-changing feature. This feature has already been all the rage over the Internet. This might just be our biggest release yet, thanks in no small part to the new runahead latency reduction system.

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