High CPU usage when viewing #matrix:matrix.org

### Steps to reproduce

1. Log into an account and join #matrix:matrix.org
2. Navigate to https://app.element.io/#/room/#matrix:matrix.org
3. Look at the browser's CPU usage

### Outcome

#### What did you expect?
After loading, CPU usage goes down to negligible amounts

#### What happened instead?
It's pinned at 100% of one core

[Here's a profile from Firefox](https://github.com/user-attachments/files/18138854/Firefox.2024-12-14.22.11.profile.json.gz)

### Operating system

macOS 15.2（24C101）

### Browser information

Firefox 134.0b10

### URL for webapp

app.element.io

### Application version

Element version: 1.11.87 Crypto version: Rust SDK 0.7.2 (517d99b), Vodozemac 0.7.0

### Homeserver

matrix.org

### Will you send logs?

Yes