I'm developing a site in asp.net where I need to upload files (.mat), and receive values in a list to plot line graphics, with many points (about 200,000 points) on a single page. The plotting issue can be solved using Microsoft Chart Control, but it takes a long time (about 30 seconds), which should not happen on the system I'm developing. Is there any other tool or library I can use that allows me to plot graphics quickly? I had thought of the possibility of plotting the graph the moment I upload the file, and somehow save the graph plotted as a file on the server, and at the time I need to display the graph just open this file, but not I have no idea how I can do this. Is there any way to save a graph as a file on the server? Preferably, I want to use free tools and libraries.
Thank you