How much ram does gnome-shell need?

Wed Aug 28 23:11:00 UTC 2013

According to top:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
31671 mrsam     20   0 2485468 1.367g  30832 S   3.3  8.7 177:39.99 virt-manag+
 1976 root      20   0 1127408  29764  13276 S   3.0  0.2 172:12.81 libvirtd
 4342 mrsam     20   0 4731588 2.905g  39776 S   2.7 18.5 354:05.36 gnome- 
shell

Does gnome-shell really need 3 gigabytes of RAM, to do WTF it does, and does  
virt-manager really need 1.3 gigs?

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