Description:

After updating NVIDIA drivers from v577.00 to v580.88 (and all subsequent versions, including the latest), Minecraft with Vulkan Mod shows severe performance and responsiveness issues.

Observed Behavior

• FPS drops from a stable ~350 FPS to a consistent 20–30 FPS.

• Heavy input lag (~0.5 seconds), noticeable both in-game and in menus, making the game sluggish and unplayable.

• It seems Vulkan Mod may not be using the discrete GPU (GTX 1650 Laptop GPU), though I cannot confirm this with certainty.

• Reverting to NVIDIA driver 577.00 immediately restores expected performance and responsiveness.

System Specifications

• CPU: Intel Core i7-10750H
• GPU: NVIDIA GTX 1650 Notebook (discrete GPU)
• RAM: 32 GB
• OS: Windows 11 24H2 (OS Build 26100.4946)
• Minecraft: 1.21 (Fabric Loader)
• Vulkan Mod version: 0.5.5

Steps to Reproduce

• Install NVIDIA driver 580.88 (or any newer version).

• Launch Minecraft 1.21 (Fabric) with Vulkan Mod v0.5.5.

• Observe FPS locked around 20–30 FPS and severe input lag (even in menus).

• Roll back to driver 577.00.

• Performance returns to normal (~350 FPS, no input lag).

Expected Behavior

Vulkan Mod should consistently utilize the discrete GPU and deliver smooth, high FPS gameplay with no input lag, regardless of driver version.

Troubleshooting Attempts

• Forced GPU selection via:

  • NVIDIA Control Panel → Manage 3D settings → Preferred graphics processor.

  • Windows Graphics Settings (set to “High Performance”).

• Tested with multiple driver versions (≥ 580.88) — issue persists.

• Reinstalling drivers did not resolve the problem.