Kde Neon started out ok for me but slowed a low spec laptop to the point of being unusable within a few months. Other distros have run fine on the same machine

Kde Neon started out ok for me but slowed a low spec laptop to the point of being unusable within a few months. Other distros have run fine on the same machine before and afterwards. On top of that, Kmail somehow destroyed a couple of years of messages. I've been using Manjaro with Xfce lately and wish I had done so originally.