i have a suggestion, but i dont know if you like this. i needed charts with multiple axis and every axis has 1440 datapoints (they can only be 0 or 1 in my case) and they work fine. what i had to do for this is to change the x-axis datatype and generate the date 'manualy'.
create categories on the x-axis with the date:
categories: ['00:00', '00:01', '00:02', '00:03', ..., '23:59']
then every datapoint is ordered the same as the category:
data: [1, 1, 1, 1, 1, 1, ..., null]
i know this is messy but when you do this you can reduce the data array to just the y-axis value and the rendering takes less time. see jsfiddle.
i have found that animation can impact chart load times for large data sets. try disabling animation:
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