title: Representing sparse data in a Highcharts series
body: <p>I'm trying to generate a stacked column chart. What I want is similar to this <a href="http://bit.ly/WSX6xE" rel="nofollow">JSfiddle</a> example. However, I have around 30 categories and 1000 series. The series are rather sparse. There are only about 200 values. But because highcharts needs each series to have values across the x-axis categories, I'm forced to submit 1000 series each having 30 values (mostly zeroes). The chart takes over a minute to render. How can I improve this performance?</p>