[Bug]: Inpaint, Sketch, Inpaint Sketch not useable. Whole browser hangs.

### Checklist

- [X] The issue exists after disabling all extensions
- [X] The issue exists on a clean installation of webui
- [X] The issue is caused by an extension, but I believe it is caused by a bug in the webui
- [X] The issue exists in the current version of the webui
- [X] The issue has not been reported before recently
- [X] The issue has been reported before but has not been fixed yet

### What happened?

When I try to use any of these features that allow painting into the picture, it's awfully slow. First it needs a while until the image loads at all, it's picking up random clicks while loading (for instance brush size changes a few times), the mouse is invisible. Also the CPU fan is speeding up. When it finally finished doing what ever takes so long the mouse finally moves again, then I can paint and it works relatively smooth until I release the mouse button then it hangs again.

### Steps to reproduce the problem

1. Create image
2. Send to inpaint, sketch etc.
3. Try to paint in it

### What should have happened?

Work... 🙄

### What browsers do you use to access the UI ?

_No response_

### Sysinfo

version: [f0.0.17v1.8.0rc-latest-276-g29be1da7](https://github.com/lllyasviel/stable-diffusion-webui-forge/commit/29be1da7cf2b5dccfc70fbdd33eb35c56a31ffb7)  •  python: 3.10.13  •  torch: 2.0.1+cu118  •  xformers: 0.0.20  •  gradio: 3.41.2

i7 7700 48GB RAM 4060 16GB VRAM
Firefox 123.0.1 (64-bit)

### Console logs

```Shell
Nothing in console log has anything to do with the issue.
```

### Additional information

_No response_

No source files, tests, or entry points are identified in the issue. Reproduce the problem by creating an image, sending it to inpaint or sketch, and painting in Firefox 123.0.1; done means the image loads promptly and painting does not hang the browser after mouse release.

Written by the indexing model from the issue text.