My aging laptop gets about 1 hour battery life on Karmic with compiz running (GNOME). With KDE4 it gets 45min. using the most aggressive power save profile.
Anyway, KDE4 just uses more RAM. On my 32bit laptop GNOME idles around 200-600MB after prolonged usage, with KDE4 showing a bit higher numbers (200-800MB). On my 64bit desktop, KDE4 with plasmoids on the desktop and effects shows me 800MB-1.7GB after a few hours of up time, and GNOME with Compiz running 500MB-1.5GB.
Anyway, KDE4 just uses more RAM. On my 32bit laptop GNOME idles around 200-600MB after prolonged usage, with KDE4 showing a bit higher numbers (200-800MB). On my 64bit desktop, KDE4 with plasmoids on the desktop and effects shows me 800MB-1.7GB after a few hours of up time, and GNOME with Compiz running 500MB-1.5GB.
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