As well as the Lite version of the social network, Facebook provides a lighter version for Messenger too.
Those lighter versions are produced just for some developing countries, so you can’t directly download them from the Google Play, but you can get the apk from ApkMirror as well.
In my opinion they are even better than the full ones:
- Less battery consumption
- Less CPU usage
- Less RAM used
- Less space required
Of course, you won’t find all the goodies of the full verions but, they do their job greatly.