In a previous post I asked how much memory my laptop needed, and found the answer was more than ii had, so I added some.
At the time I was using XFCE, but now the same laptop is running Gnome 3, so decided to compare memory usage.
XFCE used 912MB of memory when it had loaded (converted from 870MiB in the screenshot below).
Gnome uses 1.3GB when it has loaded.
In both cases, there were multiple active tabs open, although different web sites with different content. I didn't attempt to use the same web sites, and I am assuming that the different memory usage by Firefox was down to the different websites open in tabs at the time. Memory usage by browsers does vary wildly according to the number of tabs open and the content of those tabs.
On a computer with limited memory, XFCE can be a good option, although the memory saved can be eaten up quickly by modern web pages with their scripts, videos and images.
Both XFCE and Gnome are perfectly usable on this very low spec computer (with XFCE having a slight edge in snappiness on occasion), but adding the extra 4GB of memory has made both much more usable with a modern bowser with a dozen or more tabs open.
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