GTA IV RTX Remix Update 1.1.5 – Ultimate Performance & Configuration Guide (Path Tracing Optimized)

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Grand Theft Auto IV has always been remembered for its gritty atmosphere, dense urban design, and ambitious physics systems—but few could have imagined Liberty City reborn with full path tracing. The GTA IV RTX Remix project has turned that vision into reality, pushing NVIDIA’s Remix technology to its absolute limits. However, stunning visuals mean nothing if the game isn’t playable.

That’s where RTX Remix Update 1.1.5 comes in.

Rather than chasing flashy new effects, this update focuses on performance stability, configuration control, and visual refinement—the exact improvements needed to turn a jaw-dropping technical showcase into a genuinely playable experience. If you’ve ever loaded into RTX Remix and immediately asked “Why am I not hitting 60 FPS?”, this guide is for you.

This article breaks down what’s new in 1.1.5, how to install it correctly, and the most important performance tweaks that make the biggest real-world difference.

What’s New in GTA IV RTX Remix 1.1.5

Unlike earlier releases that introduced major systems, version 1.1.5 is all about refinement. These improvements directly impact performance, stability, and visual consistency.

Area of ImprovementKey Changes in Update 1.1.5
⚙️ User ConfigurationAdded ability to disable projected light coronas and unhide hidden options via rtx.conf. Corona textures are no longer ignored by default.
🧩 Visual FixesFixed broken meshes, improved glass materials, and refined metal surfaces on taxis.
🌧️ Weather SystemRain particle effects adjusted, collision thickness reduced, and rain restart bugs fixed.
🛠️ General PolishMore decal textures tagged correctly and layout improvements made to the in-game ImGui menu.

These changes form the foundation for the performance gains discussed later in this guide.

Step-by-Step: How to Download & Install RTX Remix 1.1.5

GTA IV RTX Remix Update 1.1.5 – Performance & Configuration Guide

Before installing, note this critical requirement:

⚠️ RTX Remix ONLY works with GTA IV: The Complete Edition (v1.2.0.59)

Installation Steps

  1. Download from the Official Source
    The only legitimate and safe source for the mod is the project’s GitHub release page.

  2. Run the Installer
    The installer includes a mandatory custom fork of FusionFix.

    🔴 Do not skip this step.
    You must accept the FusionFix installation prompt, or the game will crash.

  3. Launch the Game Correctly
    Do NOT launch through Steam.

    Instead, use the included .bat files.
    Recommended for most users:

    _LaunchWithProcessorAffinity_Half_GTA4__Half_Remix.bat

    This splits CPU workload and significantly reduces stuttering.

  4. Access In-Game Menus

    • Alt + X → RTX Remix settings (Path Tracing, DLSS, XeSS)

    • F4 → Compatibility Mod menu (game-specific optimizations)

Mastering Performance in RTX Remix 1.1.5

The Hard Truth: GTA IV Is CPU-Bound

Even with a powerful GPU, GTA IV’s dense geometry and simulation systems hammer the CPU. Seeing low GPU usage is completely normal.

Your goal is to reduce CPU load, not push the GPU harder.

The #1 Performance Fix (Most Important Step)

Lower View & Detail Distance

This single change provides the largest FPS improvement.

Steps:

  1. Open GTA IV’s Display Settings

  2. Set:

    • View Distance: ~30

    • Detail Distance: ~40

Why this works:

  • Reduces object count per frame

  • Dramatically lowers CPU draw-call overhead

  • Improves frame pacing and stability

Advanced Performance Tweaks (F4 Compatibility Menu)

Open the menu using F4 and adjust:

  • Tree Alpha Cutout Value
    Increase to ~160
    ➜ Makes distant foliage more blocky but improves performance

  • Vehicle Alpha Cutout Value
    Similar effect for distant vehicles

These settings trade subtle visual detail for meaningful CPU relief.

GPU-Specific Optimization Tips

NVIDIA GPUs

  • Enable DLSS Super Resolution (Quality or Balanced)

  • RTX 40-series users should enable DLSS Frame Generation

    • Massive FPS gains with minimal visual cost

AMD GPUs

  • Fully supported

  • Use XeSS via the Alt + X menu

  • Expect solid results, though NVIDIA hardware benefits more overall

Editing rtx.conf – New Controls in 1.1.5

The rtx.conf file is located in your GTA IV root folder and can be edited with Notepad.

New & Useful Options

rtx.forceIgnoreTexture coronas = false

  • Re-enables projected light coronas if previously disabled

rtx.optionUISettingsHiddenEntries = true

  • Unlocks hidden advanced options in the RTX Remix menu

⚠️ Warning:
Incorrect edits or typos can prevent the mod from loading. Always back up the file before editing.

Troubleshooting Common Problems

Heavy Stuttering

  • Ensure you launched via the correct .bat file

Crashes on Startup

  • Re-run installer

  • Confirm custom FusionFix was installed

Low FPS with Low GPU Usage

  • You are CPU-bound

  • Lower View & Detail Distance further

Broken Lighting or Textures

  • Verify the mod was downloaded from the official source

  • Community Discords and forums often provide quick fixes

Conclusion: A Crucial Update for Playability

GTA IV RTX Remix Update 1.1.5 may not introduce headline-grabbing features, but it is one of the most important releases so far. By refining demanding effects, fixing visual inconsistencies, and—most importantly—giving players direct performance control, it bridges the gap between technical showcase and playable experience.

With the right configuration, Liberty City is no longer just something to admire in screenshots—it’s a world you can actually live in again. As HD assets, new models, and community enhancements continue to build on this stable foundation, RTX Remix is shaping up to be the definitive way to revisit Niko Bellic’s story.   

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