Switching spaces is slow

#### Describe the bug

On my modestly sized account with ~8 spaces containing ~10 rooms each, switching spaces is generally slow. It often takes 1 to 2 seconds from the moment when I tap on a space in the side panel, to when I actually see the room list populated with that space's rooms. The performance of this common interaction could be improved.

Edit: With ~200 rooms, switching spaces sometimes takes upwards of 30 seconds.

#### Smartphone (please complete the following information):
- Device: Google Pixel 3a
- OS: LineageOS 15.1

#### Additional context
- App version and store: 1.1.14 - F-Droid
- Homeserver: robin.town