title: Highcharts scatter plot with lots of data points running really slow
body: <p>I've seen a few suggestions here, but nothing seems to apply to my situation.  I've also seen some unresolved similar issues.  I have scatter plot with a lot of data (about 40k) points.  It's really slow.  The link below (genetic data - called a Manhattan plot) will eventually load, but it's just slow. I need to find a way to optimize performance. </p>
  
  <p><a href="http://ricediversity.org/test/highcharts/examples/line-ajax/index-b.htm" rel="noreferrer">http://ricediversity.org/test/highcharts/examples/line-ajax/index-b.htm</a></p>
  
  <p>Also, I'm trying to add additional info (data fields) to my tooltip from my data file, but I can't get that working either.  Any suggestions?</p>