Lightweight desktops?

I often read that you should pick a lightweight distro for older PCs as they demand fewer resources. All of the desktops seem to do the same thing. What is the difference? What extra do you get when you use KDE instead of a lightweight desktop?
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Relevant Pages

  • Re: Lightweight desktops?
    ... Oliver Joa wrote: ... they demand fewer resources. ... All of the desktops seem to do the same ...
    (comp.os.linux.misc)
  • Re: Lightweight desktops?
    ... they demand fewer resources. ... All of the desktops seem to do the same ... What extra do you get when you use KDE ...
    (comp.os.linux.misc)
  • Re: Lightweight desktops?
    ... A Watcher wrote: ... they demand fewer resources. ... All of the desktops seem to do the same thing. ...
    (comp.os.linux.misc)
  • Sharing resources
    ... is possible for one of my desktops at home to make use of ... images and rendering those images takes hours and hours. ... I know if I had a dual processor it would make a ... so I thought maybe I could share resources. ...
    (microsoft.public.windowsxp.network_web)
  • Re: Lightweight desktops?
    ... they demand fewer resources. ... What extra do you get when you use KDE ... instead of a lightweight desktop? ... install several desktops and allow you to change at login. ...
    (comp.os.linux.misc)