GTA 4 was released in 2008. It was built using DirectX 9.0c. At the time, memory management for video games was handled differently. The game has a hard-coded limit on how much RAM and VRAM it can access. On modern systems with 16GB+ RAM and 8GB+ VRAM, GTA 4 gets confused. It often fails to recognize your graphics card, caps your settings arbitrarily, and suffers from memory leaks that cause the game to crash after 15 to 20 minutes of gameplay.
Unlock the true potential of Grand Theft Auto IV on PC by solving the infamous memory leak and stuttering issues with our complete DXVK guide.
A: It is difficult. ENB hooks DirectX 9, while DXVK replaces it. Reshade can work if you install Reshade in Vulkan mode, but stability is not guaranteed. Use FusionFix instead of ENB.
dxvk.enableAsync = true
GTA IV was built for DirectX 9, an API from 2002. Modern GPUs are terrible at processing old DirectX 9 instructions because they rely heavily on driver overhead. DXVK bypasses this, resulting in:
This is the core process. Follow these steps carefully to apply the fix.