Fusion Fix adds a skip menu and skip intro option to load right into your last save once you launch the game. The mod also improves loading times significantly.

This makes getting in-game in GTA IV much faster when using Fusion Fix.

GTA IV's mouse input was broken at higher frame rates such as 60FPS and it would barely respond to smaller inputs.

Fusion Fix improves mouse input with a raw input option added to the menu, making mouse controls much more accurate for the player.

Z-Fighting was extremely prevalent on PC, gaining any sort of height would cause a lot of the map to flicker repeatedly.

Fusion Fix fixes this and z-fighting is basically eliminated entirely.

Cutscenes were broken on PC over 30FPS.

At higher frame rates the camera and characters in cutscenes stutter significantly even if your frame rate is consistent and the field of view also changed weirdly in each scene.

Fusion Fix fixes all of these issues.

The camera is supposed to shake as Niko moves in the vanilla game, but the effect becomes almost invisible above 30FPS.

Fusion Fix fixes this so the camera shake effect works at any frame rate and it also adds an option in the pause menu to disable it entirely.

Motion blur got weaker as your frame rate got higher in the vanilla game.

Fusion Fix allows you to select the strength of the motion blur in the pause menu, as well as giving you the option to turn it off entirely.

The PC port is full of issues not seen on console.

While the PC port is mostly known for having poor performance, there are also tons of graphical effects missing, plenty of graphical effects broken, z-fighting all over the map, cutscenes judder above 30FPS and much more.