[Solved]-Highcharts : smooth / anti-aliasing line-Highcharts

It depends on whether what you want is actually improved antialiasing, or if what you really want is a smoother curve interpolated through the data points.

If you want better antialiasing, you'd have to look at the SVG options - though I don't see much room for improvement in this case, honestly.

If you want a smooth curve then what you want is the spline chart type:

http://highcharts.com/demo/spline-plot-bands

Just keep in mind that a spline distorts the data by using a particular formula to smooth a curve between points, which can increase the severity of the difference between high and low points - it shouldn't be used simply for aesthetics.

I've solved adding the line

Highcharts.seriesTypes.line.prototype.getPointSpline = Highcharts.seriesTypes.spline.prototype.getPointSpline;

before creating the chart (adapted from this thread).

Demo on JSFiddle. Screenshot below.