It uses less RAM than 16.10 and 16.04. Difference is about 500 MB on start and 1Gb after launching different applications. It's hard for me to compare 14.04 and 17.04, because it's 2.5 years passed. But I think moving to systemd increased RAM usage anyway. And some new versions of daemons and libraries can use more RAM than their 14.04 versions.
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