Incremental sync feels *much* slower to process (since EDR?) as it processes gradually and slowly

### Steps to reproduce

1. Open laptop in morning
2. Watch it take 20-30s very very slowly trickling in updates to the roomlist, which slowly bounces around until it finally settles, making it unusable (you can't click on things as they jump around) and making it feel sluggish.

This used to either happen very fast, or possibly even atomically.

### Outcome

#### What did you expect?

Relatively atomic-feeling sync

#### What happened instead?

Very gradual sync.

### Operating system

_No response_

### Application version

Element Nightly version: 2024041601 Crypto version: Rust SDK 0.7.0 (61b175b), Vodozemac 0.5.1

### How did you install the app?

_No response_

### Homeserver

_No response_

### Will you send logs?

Yes