Loading an issue take more than 20 secs
Description
This issue, which has ~50 comments and images, takes more than 20 seconds to load usually.
On the time of the recording, it took more than 30 seconds.
The browser almost seems to suffer from loading all the content. Moreover, the page keeps jumping (as we load images).
It seems that we
- load too many assets
- do not set the image height for the img tag, which makes the page to jump when we load images.
We should do something about this.
cc @stanhu