title: HighStock: Loading series data asynchronously as needed
body: <p>I want to display multiple years of historical stock data in a HighChart. The json data size for all the years is 5mb, why I want to avoid loading all at once. Especially because most users will only need the last 6 month.</p>
  
  <p>I would like to fetch the first 6 months initially. If the user zooms out or "moves" backwards in time I would like to load the whole data. Has someone a recipe for this? What is the starting point? Are there any HighChart events I could listen to, to get notified when the user zooms out or moves?</p>