v1.26.13 / v1.28.2 - Mask editor unusable

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have searched existing issues to make sure this isn't a duplicate
- [x] I have tested with all custom nodes disabled ([see how](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled))

### What happened?

Mask editor is broken now, severe performance degradation. Running at 4fps, so laggy its not even useable.

### Steps to Reproduce

1. Open the mask editor
2. Witness the severe lag which makes it unusable

### How is this affecting you?

Feature is not functioning.

### ComfyUI Frontend Version

v1.26.13 / v1.28.2

### Browser

Brave Browser

### Additional Context

Seems to be related to 4k monitor or the size of the browser for some reason.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-5799-v1-26-13-v1-28-2-Mask-editor-unusable-27a6d73d365081919403d264855f4846) by [Unito](https://www.unito.io)