Hi, I tried the feature in your plugin, but that’s not quite the same: when I display the topic list, that’s the requested content which fades in after being loaded; on NodeBB, it’s the current content that fades out while the next content is being loaded.
The main thing is that we should find a way to prevent Discourse removing the current HTML immediately after clicking a link. The HTML should be kept in place until the new content has been loaded (or until the fade out effect has ended but I’m not sure that’s better 
) and is ready to be displayed.