V3 is not ready for production. Even though the line charts have 'date time' input options, current version cannot display datetimes correctly. Is documented in forum and unresolved. If you need to graph datetimes use v2.x.

When do we get the option to use https://api.highcharts.com/highcharts/boost ? The chart becomes slow very easily when you want to plot multiple data points

my JSON formatting stopped working on Line charts