Google Chrome seems to use lots of memory especially when there are lots of tabs open at once. It quite often slows down my machine significantly to the point that I have to restart the browser (with all tabs still open after the restart) and then it gradually slows down again. I'm glad I came across The Great Suspender. This extension allows me to suspend any tab manually, or let it suspend idle tabs for me automatically.
Refs
http://lifehacker.com/5982490/the-great-suspender-suspends-memory+hungry-chrome-tabs-you-havent-used-latelyhttps://chrome.google.com/webstore/detail/the-great-suspender/klbibkeccnjlkjkiokjodocebajanakg?utm_source=chrome-ntp-icon