score:2

Accepted answer

It was because of the Highcharts animation when the bars are initialized.

Actually I had the animation disabled in the chart configuration, like:

    $('#container').highcharts({
    chart: {
        type: 'bar',
        animation: false
    },

But this seems not to be enough. The animation must be disabled explicitly for the chart type:

    plotOptions: {
        bar: {
            animation: false,
            enableMouseTracking: false
        }
    } 

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