Best: Errgfxd3dshader1

Tessellation hugely impacts shader complexity. Disabling it in-game often resolves ERR_GFX_D3D_SHADER1 completely.

When a Direct3D application reports an error for a specific shader, common underlying HRESULT values include:

Open your game directory (e.g., Steam\steamapps\common\Grand Theft Auto V ). errgfxd3dshader1 best

Scroll down to find and temporarily set it to Disabled . Click Apply .

If you have overclocked your GPU using tools like MSI Afterburner, reset them to to ensure stability. Tessellation hugely impacts shader complexity

If the game launches, change the in-game to 10 or 10.1 in the Graphics settings.

Corrupted DLL files related to DirectX can trigger this error. Scroll down to find and temporarily set it to Disabled

If the game supports it, try switching between DX11 and DX12 in the settings menu. Summary Checklist for Best Performance Update GPU Drivers Ensure shader compatibility Verify Game Files Replace corrupted shader files Clear Shader Cache Rebuild broken shader data Reinstall DirectX Repair graphics API Disable Overlays Prevent app interference

Don't waste hours sifting through outdated forum posts. Use this ranked action plan:

Fixing stuttering while improving visual fidelity. Part 3: How to Choose the "Best" Shader

Step-by-step fixes (ordered from simplest to advanced)