To achieve "Pro" status for your installation, you shouldn't just rely on one tool. You need a combination of fixes that address different layers of the engine. 1. DXVK (The Performance King)
Keep this between 25–40. Setting it to 100 will tank your performance, even on an RTX 4090, due to engine limitations. gta iv pro fixer
The "Complete Edition" update added layers of DRM that can impact performance. The Essential Toolkit for a Stable Experience To achieve "Pro" status for your installation, you
Grand Theft Auto IV is a masterpiece of storytelling and atmosphere, but its PC port is notoriously one of the most unoptimized releases in gaming history. Even on modern high-end hardware, players face stuttering, low frame rates, and broken visual effects. This is where the GTA IV Pro Fixer—and the broader suite of essential community patches—comes into play. DXVK (The Performance King) Keep this between 25–40
Leading to the "out of video memory" error on modern GPUs.
Drop the d3d9.dll and dxgi.dll files from the DXVK package into your GTA IV main folder. 2. FusionFix
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