У вашего броузера проблема в совместимости с HTML5
FPS, CPU & GPU usage, etc is displayed on the top right corner of the screen.
Resolution 1600x900 (as it is my monitor's max resolution)
Graphics settings: High (settings @3:14)
Recorded with Nvidia Shadowplay. Without recording, fps is the same, 60+fps. All spikes/stutter/lag you see is not present ingame.
GPU: Gigabyte GeForce GTX 1050
CPU: Intel Pentium G4400 @ 3.30GHz
Memory: 8 GB DDR4 @2133MHZ
OS: Windows 7 Professional
Mobo: MSI H110M PRO-VD