Martin Wimpress said that, after some rigorous tests, it was discovered that the upcoming Ubuntu MATE 16.10 (Yakkety Yak) release would use less RAM.
Why and how that happened? Well, it appears that when building the MATE 1.14.1 desktop environment against the latest GTK3 technologies, the entire Ubuntu MATE 16.10 operating system will consume much less system memory than Ubuntu MATE 16.04 LTS with MATE 1.14.1 desktop built against the GTK2 libraries.
A factor that will make Ubuntu MATE 16.10 (Yakkety Yak) use less RAM than Ubuntu MATE 16.04 LTS (Xenial Xerus) is that all the default applications pre-installed are using the latest GTK3 technologies, and not the GTK2 ones.
Submitted by: Arnfried Walbrecht