Running "heavyweight" applications with lightweight Desktop Environments

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http://askubuntu.com – I have always been running XFCE on my Ubuntu machines for its performance advantage over the other DEs. However I run my favourite applications on it which includes apps traditionally bundled with GNOME and KDE (gnome-power-statistics, gnome-system-monitor, kate, kdesvn to name a few). Does this significantly diminish the performance advantage I get from using a lightweight Desktop Environment? As a whole bunch of dependencies are installed when I first install these apps from other desktop environments. (HowTos)