Appearance panel is laggy again and loads background slower than before

Affected version

46.alpha - GNOME OS

Description

It seems that issue #2448 (closed) returned, but in a worse way: the lagginess of the Appearance increased (it also makes the entire Settings laggy) and now backgrounds load one by one with lots of delays:

Screencast_from_2024-02-02_17-48-35

This issue consistently happens here.