title: How to draw heatmap with huge data
body: <p>i want to draw a heatmap base on about 1,100,000 records.
  i used <a href="http://bl.ocks.org/tjdecke/5558084" rel="nofollow">This tutorial</a> to draw my heat map but when i run the code browser crashes and give 'not responsive javascript code ' error.
  any idea?</p>