SM64 Fast3D Anti-Aliasing Reducer
This is a simple tool you can use to improve performance on real N64 hardware by forcing the game to use the reduced anti-aliasing mode instead of the full anti-aliasing mode.

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How does it work?

This tool will inject a modified version of the Fast3D 2.0D microcode that will block any attempt to write the IM_RD render mode flag into the RDP's othermode variable. Doing this forces the game to use the reduced anti-aliasing mode, which should improve performance on console by 3-4 fps (~10%).

How do I use it?

Just simply open up a Super Mario 64 ROM file, and then you can click the "Reduce the AA!" button if the ROM is compatible. Once the button is pressed, it will create a new ROM file with the ".ra" prefixed to the extension. For example, using the rom file "sm64.z64" will generate a new rom called "sm64.ra.z64".

What SM64 ROMs are supported?

Any SM64 ROM that uses the Fast3D 2.0D microcode is compatible. This includes the Japanese and North American versions of SM64 and any ROM hacks made with those versions.

What about emulators?

If you are using a high-level emulation graphics plugin like Jabo or GlideN64, then you should still get the full anti-aliasing since none of the game's code is being modified.

I have noticed that some low-level emulation plugins like angrylion do not like the custom microcode, and may make the game lag even more than before. Which is weird, because the microcode runs fine on real hardware. ¯\_(ツ)_/¯


The beginning area of Jolly Roger Bay does lag a significant amount. Going down to a 22 fps minimum in my testing. Injecting the modified microcode makes a significant difference in the feel of the game, with the minimum increased to 25 fps.

My jolly roger bay benchmark starts at the beginning of the level and has Mario swim into the underwater cave. The framerate is bad in the beginning, but gets a lot better when you are deep underwater.

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