Performance improvements

Performance and speed of Lighthouse was improved across the board. It now feels much snappier than before.

Some specifically notable improvements:

Subscribing to an RSS feed

Before the improvements it took up to 20 seconds. Now it is done within 1-3 seconds in most cases.
That's a 10x speed-up!

Navigating from content list to a specific entry

Navigating from the Inbox, Library, Archive, or Search pages to a specific entry is now up to 3x faster.

Loading lists

Loading content lists, for example in the Inbox and Library pages, is now up to 2x faster.