Chrome's predilection for gobbling up vast amounts of RAM will soon increase to new levels but it is for a very good reason.  Chrome 67 will offer a Site Isolation feature which will protect you against a variety of Spectre attacks.   When you have this feature enabled in Chrome each site would be isolated, with the a single renderer process per page.  This means coss-site iframes and pop-ups will be unable to read data from other pages; in fact a single site may spawn multiple render processes, each running in isolation.

There is of course a cost, The Inquirer was quoted an increase of 10-13% in RAM usage … so better get a 128GB kit.

"The new feature basically splits the render process into separate tasks using out-of-process iframes, which makes it difficult for speculative execution exploits like Spectre to snoop on data."

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