Interesting, my results :
CanvasMark Score: 14351 (Chrome 25 on Mac)
CanvasMark Score: 8327 (Firefox 19 on Mac)
and
CanvasMark Score: 10762 (Chrome 25 on Mac) after closing a bunch of tabs
Thanks for your answer! Highcharts looks awesome, the only issue with it is the price and the file size (the minified base js is 120k).
But still that's a start :) thanks