UI noticeably slow

### Description

I've recently started using Matrix with the Element desktop client, being a longtime IRC user.

Even though I have a reasonably strong computer (i5-7600K CPU, 16 GB memory) and not much going on in the background - there is still noticeable lag in the UI's response in some cases. It's not long, but it's noticeable. Now, it's possible that I'm perceiving lag when it's actually intentional very-short animations (which I can't turn off?) - but it feels nowhere as snappy as an IRC client.

### Steps to reproduce

This is not about a specific scenario - it's the general sense of responsiveness or lack thereof.

### Version information

Desktop.

For the desktop app:

- **OS**: Devuan GNU/Linux 3 (Beowulf)
- **Version**: 1.7.1