UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2664.0 Safari/537.36

Steps to reproduce the problem:
1. Open www.milliyet.com.tr
2. Middle click with mouse when over a news image
3. Clicked news opens in new tab with a noticeable lag on tabstrip. I can feel interruption on the animation. Stops some milliseconds and continues. Tab is not opened smoothly.
4. Tab openes very smoothly and there is no lag when clicking open in "Open in new tab" context menu

What is the expected behavior?
Tab should be opened with continious anmimaton and does not feel user that there is a lag or interruption.

What went wrong?
Tab strip is opened with lag and tab opening animation is not smooth 

Did this work before? Yes 48.0.2564.116

Chrome version: 51.0.2664.0  Channel: n/a
OS Version: 10.0
Flash Version: Shockwave Flash 21.0 r0