Most people love to revisit older games from their childhood, especially ones they have fond memories of. But while most of the classics they grew up with were fun to play, and possibly still fun now, some of them may not feel as good as modern releases. This is often due to various frames of lag or other factors from when the game was developed and released. But those who play older games through emulators such as RetroArch have a setting to play with that makes older games feel new. It's the same game you know and love, but with a little help to make it feel better to play.

The RetroArch setting called Run Ahead can make iconic games like Super Mario World feel more responsive overall. It's a neat feature for RetroArch that will enable people to experiment with older games or explore ones they may not have tried before. For titles that have significant input lag or core experiences that suffer because of it, this will be a tool to get around that hurdle. It might not fundamentally change the way a game appeals to most people, but Run Ahead is another tool for those who are passionate about retro gaming.

The benefits of Run Ahead

Simulating upcoming frames

With games like Super Mario World, there is a slight lag between the time you input a button press to when you see the result on screen. There's an inherent two frames of latency for Mario to do something as simple as a jump into the air, meaning that when you press an input corresponding to a jump, you'll jump on the third frame. And while most people don't mind that when playing such an iconic game, the truth is that lag is still present. It may not make that much of a difference to most players. But that doesn't mean something like that can be removed in order to make an already solid game feel even better.

When turned on, the Run Ahead setting will simulate and calculate frames within a game ahead of when they're supposed to happen on screen, based on your input. Relying primarily on save states that are made every frame, K future frames (where K is your Run Ahead frame value) are calculated ahead of time without any additional user inputs attached. Pressing an input will rewind to the most recent "real" frame and re-emulate those future frames with your input included. You see the game state that would normally appear 1-2 frames later, except you see it now​​​​​​. So, to the end user, that extra frame or two of input lag in Super Mario World feels instant when you decide to have Mario jump into the air. By doing this, it makes controlling Mario feel more responsive all around, where there is no lag in all the actions you take. Mario is running and jumping at the precise moment you hit the button on the controller, so you'll be able to get over tough obstacles with better timing.

There are two ways to use Run-Ahead:

In most cases, for Super Mario World, a single instance setup is completely fine. However, if you have audio issues, try a second instance setup to see if it improves your experience. Everything happens in RAM, so it's fast and, more importantly, won't wear down your SSD.

With a game like Super Mario World, there's already a solid base to it. But with other games that have issues with input lag in various ways, Run Ahead could be an invaluable tool for playing them. Calculating the right input can be somewhat tricky and different for every game, but the benefits are no less the same. Older games with incredibly poor controls due to input lag can become much better experiences, and that's not limited to just platformers. Older fighting games and even racing games that require precise timing could reap the benefits of having Run Ahead turned on within RetroArch, though keep in mind that RetroArch features like Run Ahead and Preemptive Frames are often not allowed in speedruns and competitions.

Finding the right frames

Calculating the best value

Because every game is made differently and might have a unique amount of input lag, calculating the best value for a specific game is key to taking advantage of Run Ahead. While using RetroArch, the best way to find the right value for the setting is to pause the emulation of a game in RetroArch, hit an input, and see how many frames it takes to register within the game by advancing the frames one by one. However long it takes for the input to register is the number it normally takes, to which subtracting 1 from that number gives the value to set for Run Ahead. Many other games are publicly documented, so you can often just search for how many frames of input lag a game has and use that value.

This feature is particularly powerful as, instead of seeing the feedback on your input frames later, you'll get the action right away. While this works best for games that have a lower number of frames for their actions, like Super Mario World, other games may have different results. The higher the value set for Run Ahead, the more likely that some games will show stuttering and skipping while you play. In some instances, the wrong value set for Run Ahead can also result in more lag for actions, so it can be a little tricky to find the right balance. Luckily, other features in RetroArch that reduce lag or other issues can still be taken advantage of when using the Run Ahead setting. So, with the right calculations and adjustments, an old game can feel like a modern release.

What's classic can feel better

For many people who use emulators like RetroArch to revisit some of their favorite games, features like Run Ahead will help make things better overall. Over time, more iterations and updates to emulators will increase the number of options available to tinker with and customize the experiences of playing classic games. Super Mario World is already an iconic release on the Super Nintendo, but that doesn't mean someone won't find a way to make it even better. Emulator features like Run Ahead are a step in the right direction. Other aspects of these tools will eventually find ways to make running emulators more resource-efficient on systems, while simultaneously upgrading the experiences we remember so fondly.