Recalbox got released in a new version including a bug fix: looks like in the version released the other day, many experienced lags while browsing their game lists.
We released the 17.12.01 version last Friday and some people detected some lags while browsing games and even while playing.
This was due to the steam controller service that was always started on boot, even if you don’t have a steam controller.
We fixed that behavior, and you can now upgrade your recalbox to 17.12.02.
For a fresh install, download recalbox images on archive.recalbox.com
Source: https://www.recalbox.com/blog/en/post/blog-2017-12-03-recalbox-17.12.02/