Forza Motorsport: Best VideoSettings.xml for Tire Smoke Performance

The primary objective is to adjust the Particle Effects Quality and Shader Quality specifically for transparency effects, reducing the overdraw ($D_{over}$) that occurs when multiple layers of smoke overlap in your view.

File Path & Setup

1. Navigate to: %LocalAppData%\Packages\Microsoft.ForzaMotorsport_8wekyb3d8bbwe\LocalState\ForzaMotorsport\UserConfig\VideoSettings.xml
2. Backup: Always copy the XML before editing; if the game detects a syntax error, it will reset all your graphics to “Auto.”
3. Pro Tip: For the best results in 2026, pair these tweaks with DLSS 4 / FSR 4 Ray Reconstruction, as these upscalers now handle “noisy” smoke particles much more efficiently than legacy TAA.

Optimized “Drift Stability” Configuration Table

Parameter	Recommended Value	Technical Purpose
ParticleEffectsQuality	2 (Medium)	The Master Fix. Reduces the particle count while keeping high-res textures.
ShaderQuality	3 (High)	Ensures smoke lighting ($L_{particle}$) is accurate without the Ultra-preset hit.
MirrorQuality	1 (Low)	Smoke rendered in mirrors is a huge performance hog; keep it minimal.
DeformableTerrain	4 (Extreme)	Keep high to ensure “Dirt Smoke” and “Grass Kick-up” stay detailed.
RayTracingQuality	0 (Off)	RT reflections in smoke particles are the #1 cause of “Stutter-Spikes.”

<?xml version="1.0" encoding="utf-8"?>
<VideoSettings>
    <ParticleEffectsQuality value="2"/>
    <ShaderQuality value="3"/>
    <DeformableTerrainQuality value="4"/>
    <MotionBlurQuality value="1"/>
    <MirrorQuality value="1"/>
    <RayTracingQuality value="0"/>
    <DynamicRenderQuality value="0"/>
</VideoSettings>

HowTo: Engineering the Clean-View Smoke Fix

Follow these GameEngineer.net technical steps to optimize your particle pipeline:

1. The Particle Quality Sweet Spot: In FM8, setting ParticleEffectsQuality to Medium (2) is actually more visually stable than Ultra. On Ultra, the engine generates so many 2D sprites ($N_{sprite}$) that they begin to clip into each other, creating a “flickering” mess. Medium uses fewer, higher-quality sprites with better alpha-blending.
2. Shadow Handshake: In the game menu, set Night Shadows to Off. Smoke is a “transparent” object, and calculating shadows cast by 100 smoke particles from a stadium light is a CPU nightmare ($B_{cpu}$). Disabling this keeps your FPS flat during night races.
3. Anisotropic Filtering (AF): Set this to 16x. AF has almost zero impact on modern GPUs, but it significantly sharpens the “Ground-Level” smoke where the tire meets the asphalt, making your drift transitions look crisper.
4. The “Nintendo 64” Pixel Fix: If your smoke looks like a pixelated block, ensure DynamicRenderQuality is set to 0 (Off) in the XML. This prevents the game from lowering the resolution of transparency effects ($R_{trans}$) when the action gets intense.
5. Windshield Reflection Sync: Set WindshieldReflectionQuality to Low. Like mirrors, rendering the “internal” reflection of outside smoke is a double-render pass that yields very little visual gain for a massive performance cost.

Technical Explanation: Alpha Blending and Overdraw ($O_{draw}$)

Tire smoke in Forza is rendered using Alpha-Blended Sprites. When you are spinning tires, the game stacks dozens of these transparent textures on top of each other.

$$Total\_Pixels = \sum (Screen_{res} \times Layers_{alpha})$$

Each layer requires the GPU to look “through” the pixel to the one behind it. This creates Overdraw, where the same pixel on your screen is being shaded 10-20 times per frame. By setting ParticleEffectsQuality to 2, we reduce the number of layers ($Layers_{alpha}$), significantly lowering the VRAM Bandwidth requirement and allowing the Render Thread to stay synchronized with your monitor’s 144Hz refresh rate.