It's got something to do with the kernel. Done a quick test using the
latest kernel 4.4.0-42-generic. Restarted my pc and logged in. Opened
terminal and mem usage was 1.8gb.
Done the same with the latest 4.8.1 kernel from ubuntu kernels page and
the usage was only 673mb.
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Ubuntu 16.04 Unity desktop uses much more ram than Ubuntu 15.10
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