The discrepancy is courtesy of the ad blocker extension.

blinkingled · on July 1, 2015

Chrome extensions run in their own process which means the memory usage is reported separately for each tab and extension. IOW the memory usage for the tab is that of Chrome 100%.

taspeotis · on July 1, 2015

I believe (most) ad blockers work by changing the DOM of each tab. They inject their own CSS to hide elements. The the stylesheets will be processed in the tab's process, not the extension's. This VIM page would be quite heavy on elements that need styling by CSS.

bitmapbrother · on July 1, 2015

Yes, they do run in their own process. But, so what? Did you expect the ram consumed by the extension to balloon? I didn't. It's clearly evident that these ad block extensions are inflating the memory used by the tab. So, again, why is Chrome to blame for these inefficient extensions?