I don't use chrome, but I know that it has the highest ram usage of the main web browsers. Why it has become more popular than Firefox is beyond me. On Mac I use Firefox, and mainly safari. On windows 10, edge, and Firefox.
Having windows 10 installed on my Macs as well I can tell you that Sierra definitely uses less memory and runs a lot smoother. I would say your problem is using a browser that feels empty but uses 10x the amount of ram as the other options.
Each extension, plugin in use and tab has become its own process in Chrome. With Firefox 57, it will be like this, too. If one extension, plugin or tab breaks/crashes, it doesn't bring the whole browser down with it. Currently and for a few years, Firefox boxed out plugins in use. So if they crashed, it wouldn't bring the browser as a whole down. Firefox 57 also addresses bad extension programming. Technically, a browser using more RAM is actually a good thing. It's going to be snappier. However, if the RAM available on the system is reduced to a level that hampers overall system performance, you're going to have a bad experience. Mozilla also plan on shipping out x64 as standard with FF 57 over x86 as they have for years.
Edit: I should note this on Windows. I can't speak for Sierra. Since I don't use Chrome on Sierra. However, I do recommend submitting bug or issue reports to the Chrome development channel. Every opinion and suggestion counts!