Loading a room is very slow

**Describe the bug**
Loading a room is very slow

**To Reproduce**
Steps to reproduce the behavior:
1. Go to a room

**Expected behavior**
show last messages instantly

**Screencap**
https://photos.app.goo.gl/vmWPeMvMvqPHTV2a7

**Smartphone (please complete the following information):**
- Device: xiaomi 8
- OS: MIUI 12.0.2.0

**Additional context**
- latest App version
- Homeserver: chagai.website

Add any other context about the problem here:

Maybe cache more/better? Is this related?

https://github.com/vector-im/element-android/issues/1476