Fastest way to read a huge csv file and plot the values

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C#

I need to read a csv file of around 80000 records and plot specific cell values on a chart and google map
I use CSV Helper, GMAP and Windows Charts to get this task done. But both of the below attempts take very long:
1. reading data into lists and plotting them on map and charts
2. directly trying to plot data renders forms unresponsive after a few seconds
Is there a way I can use async-await to accomplish this task. Or could i use any other collection for faster access of data values by index?
I read that dictionary and hashset don't preserve order so used lists.
Thank you

What I have tried:

using lists as data holders and data sources,
opening the file and plotting as i read