Threads: list of threads is slow to load in thread overview

### Steps to reproduce

1. Open a room
2. Click the thread icon top-right
3. Wait

### Outcome

#### What did you expect?
I can see latest thread immediately and others load over time

#### What happened instead?
It consistently takes at least 6 seconds to see any threads

### Your phone model

_No response_

### Operating system version

Android 11

### Application version and app store

App store beta track

### Homeserver

_No response_

### Will you send logs?

No

### Are you willing to provide a PR?

No