UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36

Steps to reproduce the problem:
1. Visit http://www.kevs3d.co.uk/dev/canvasmark/ in Chrome 64.
Record the final benchmark score
2. Visit http://www.kevs3d.co.uk/dev/canvasmark/ in Chrome 65. Record the final benchmark score
3. 

What is the expected behavior?
Chrome 65 has comparable or better benchmark score than Chrome 64.

What went wrong?
There is > 35% performance drop on Chrome 65 vs Chrome 64. This behaviour is vastly more pronounced on OSX 10.10 (Yosemite) and OSX 10.11 El Capitan.

The benchmark reports a score of 7300 on Chrome 64 and a score of 4500 on Chrome 65.

Did this work before? Yes Chrome v64

Does this work in other browsers? N/A

Chrome version: 65.0.3325.162  Channel: n/a
OS Version: OS X 10.10.0
Flash Version: 

I've noticed that one of our applications that heavily depends on Canvas started lagging excessively when Chrome v65 was released. This lag was vastly more pronounced on OSX 10.10 and 10.11. It's somehow better in OSX 10.11+.