Accepted answer

When you play with that example and check the JavaScript console for errors, you'll see:

Highcharts error #12:

Following that link:

Highcharts Error #12

Highcharts expects point configuration to be numbers or arrays in turbo mode

This error occurs if the option contains object configurations and the number of points exceeds the turboThreshold. It can be fixed by either setting the turboThreshold option to a higher value, or changing your point configurations to numbers or arrays. See turboThreshold.

Shockingly enough, if increase or disable the turboThreshold, the problem goes away.

Fiddle here.

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