The browser will increase its speed by using less unnecessary storage and power while in use. Tabs will now be restored from most to least recently viewed, so you get to see the most important tabs, more efficiently. Also, the browser will be able to "detect if your computer is running low on resources and stop restoring the rest of your tabs to save you precious memory." You'll be able to manually restore them if you'd still like to access them later.
Chrome can also now detect when a page is idle, and take advantage of the inactivity to free up space in its memory, as demonstrated in the video above. The team found this practice freed up memory 10 to 25 percent on many pages, giving your browser a much-needed turbo boost.