slow loading d3 / c3 chart

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I have a page with two d3 - c3 charts which are fed by json data. It takes nearly 4 seconds to load. Why is it soo slow? I can't figure it out. There are not that many data points to be plot. http://skiweather.eu/snowdata/obertilliach/852

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If you look at Developer Tools it is the initial response from the server that takes up a lot of time and not the d3 / c3 scripts. You might want to look at the backend script that generates the page.