UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36

Example URL:
http://www.scirra.com/demos/c2/sbperftest/

Steps to reproduce the problem:
1. View http://www.scirra.com/demos/c2/sbperftest/ in the Android Webview (currently v49) on a Nexus 9 (currently Android 6.0.1).
2. Observe FPS measurement and overall smoothness.

What is the expected behavior?
Performance to be approximately the same as in the Chrome browser, which on the same device can hit a smooth 60 FPS.

What went wrong?
The test runs with severe jank. It can only average 38 FPS and severe juddering is clearly visible.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes 

Chrome version: 49.0.2623.87  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 21.0 r0

This also reproduces in this APK built with Cordova using local resources: http://www.scirra.com/labs/sbperftestwv.apk

This issue appears to be specific to the Nexus 9 device. Other devices I have tested which are not affected include:
Samsung Galaxy Tab S2 8
Moto X (2nd gen)
Nexus 7 (1st gen)