I know there are a lot of topics on this, but here is another one.
My wife has a laptop (it is an older toshiba satalite with celeron 1.4ghz and ram is maxed out at 1 gb). She has been using the regular kde3 version for a long time, and is used to it. But she does complain that her computer is slow (its not that slow, she complains more when she is running windows xp on it), so I don't think I want to update hers to kde4.
My question is, which desktop would be the fastest, and yet not make it too hard for her to figure out. I am guessing lxde would be the fastest, but will it make much of a difference? I like kde4 a lot, and I also like gnome. I have less experience with lxde and xfce, but I am sure they would both be fine once I got used to them. But I would only want to try to get used to them if they really use less system resources. If not, I will go to kde4 once it is really ready, or gnome.