I have coded a little engine to display 5 sprites using javascript in Canvas2D. Everything works fine and is completely optimised.
The FPS fluctuates between 30 and 60 - but the interesting thing is, it says on a constant 60 fps when the google javascript console is open!
Any body else experiencing this?
n.b. I am using requestAnimationFrame
Edit:
Example: http://jsfiddle.net/jrPNy/1
Play Around with the "Particles" Number so your fps is around 40-50. Than open the console, and it goes up to 60 fps. (Chrome 21.0.1180.83)