UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36

Steps to reproduce the problem:
1. Open link http://www.w3schools.com/bootstrap/trybs_affix_navbar.htm
2. Scroll to top and bottom fast
3. Navbar (with position: fixed) is shakes

What is the expected behavior?

What went wrong?
Element shakes with position fixed.

Did this work before? Yes 

Chrome version: 49.0.2623.75  Channel: stable
OS Version: 
Flash Version: Shockwave Flash 20.0 r0