Comfy-Org / Comfy-Org/ComfyUI

Slow Boot

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#8,648 1 comment 0 reactions 0 assignees View on GitHub
Potential Bug
Dominant language
Python
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Description

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

ComfyUI boots on Windows as fast as it does on Linux.

### Actual Behavior

Is stuck on the following for an extended period of time:
**Checkpoint files will always be loaded safely.
Total VRAM 32607 MB, total RAM 64678 MB
pytorch version: 2.8.0.dev20250622+cu128
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 5090 : cudaMallocAsync
Using pytorch attention**

### Steps to Reproduce

Start ComfyUI

### Debug Logs

```powershell
Checkpoint files will always be loaded safely.
Total VRAM 32607 MB, total RAM 64678 MB
pytorch version: 2.8.0.dev20250622+cu128
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 5090 : cudaMallocAsync
Using pytorch attention
```

### Other

So i tried a lot of things and no matter what I do ComfyUI always starts WAY faster on Linux than on Windows. Does anyone know how I can significantly speed up boot times, imitating Linux behaviour? (Without WSL or similar since im already on a dualboot rig)

Contributor guide

Open the contributing guide

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