My Windows without browser (so desktop with icons only): Physical Memory 322MB on Process Hacker for now...
I use CENT browser Version 1.8.9.28 which is based on Chromium 49.0.2623.105
Windows with my CENT (with too many extensions: 17):
800 MB - so without Windows, CENT has 800-322=478 MB, 0% CPU (1.56% or 3% by pics) with the New Tab (about:blank) only.
In Process Hacker I see first chrome.exe process: 160 MB, then one chrome.exe have 117 MB, and all other chrome.exe has about 49 to 51 MB each one...
I've to remove some extensions, but it's difficult for me, I like each one of them
To look on each extension Memory, and CPU load, don't use Task Manager which has 3.13 %CPU load, but type:
chrome://memory-redirect - so you see 0% CPU for your enjoyment, I hope for you.
To look easily on the CPU percentage, I use BitBlock extension.
EDIT:
Sorry, post revised, digits corrected, uh