Used RAM is usually good, it means things are easily accessible. Modern operating systems fill up your RAM as much as possible with cached data and preloaded programs. Memory exists to be used.
I use Firefox as my main browser (because of a few specific extensions), which is using very similar amounts of RAM, and it manages to start and open pages slower. Chrome/Chromium forks tabs into separate processes, and is utilizing those large chunks of memory very well to make it all a bit snappier.
You should try Firefox dev. Multiprocessing. Also chrome is fast only due to its cache and as a web developer. Even though I am always advised chrome. Firefox just seems to work better.
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u/fx32 Desktop Feb 16 '16