Question

I would like to create line chart with thousands of points that completely refreshes at least 10 times per second. What are some techniques for increasing the performance of charts with a lot of data to display?

One idea I’ve had is to change the number of draw calls from being based on the number of data points to being based on the number of pixels available. I could divide the data into bins along the X axis and draw a vertical line between the min and max for each bin.

Answer 1

There is a good article about charting performance over on the Visiblox blog, here.

You might not be using this particular charting library in your application, but the main points of the article will still apply. Its all about carefully selecting what you need to show when. The main points of the article are:

• Consider carefully the type of series
  to use
• Where possible set explicit ranges on
  the axes
• Remove points that are offscreen from
  the DataSeries
• Remove data generation from the UI
  thread
• Reduce or disable animations
• Think carefully about the amount of
  data and the frequency of updates

There’s also a slightly less helpful article on the MSDN blog, but it should help to outline some of the key areas when improving chart performance.