UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/56.0.2924.76 Chrome/56.0.2924.76 Safari/537.36

Steps to reproduce the problem:
1. Open a HD Youtube video or a website with lots of graphics/images/gradients.
2. Scroll up and down, back and forth.
3. See CPU usage go up close to the maximum on all 4 Threads.

What is the expected behavior?
In Firefox the CPU usage goes up to about 30% average on each Thread, when scrolling. I was expecting similar in Chromium.

What went wrong?
Chromium shutters when I scroll pages with a lot of graphics/images/gradients or play Youtube videos.

Did this work before? N/A 

Chrome version: 56.0.2924.76  Channel: n/a
OS Version: Kernel 4.4.0-66 Mint 18.1
Flash Version: Not installed

I use a Thinkpad x230 with i7 3520M (Intel HD 4000 Graphics), 16GB RAM, SSD. Just in case.