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Some heavy pages sometimes start eating a lot of RAM and CPU here, mostly Facebook pages with videos. With Shift-ESC you can quickly see which page is the culprit. Closing that page alone solves the issue. And often reloading the same page in a new tab doesn't produce the problem again.

And regarding the RAM usage on your computer, you should go to the Details tab, right click on any column header, select columns and add the "Memory - Commit Size" column. In my experience that's the most realistic value, and a high number there will make your computer crawl. Order by that column and see what you find.