DPlot

What's the maximum number of curves I can load into a dplot using the dplotlib.dll? I've a large number of curves to plot though they are all quite small being 1000 data points and have a fixed dx however I may have 10-100 thousands of them.

100.
I started to suggest grouping all the points and doing a scatter plot, as personally I can't see the usefulness of 100,000 curves. But even then you'll likely run into memory limitations. If you really have 1000 points in 100,000 separate "curves" that's 100 million points. I've plotted 90 million points after rebooting, but 100 million is likely too many on any system.

It's not that big the data is floats so in ram the data by itself is 0.7 of a gb for 100,000 curves. Can easily have 100gb of ram on a machine. I don't necessarily want to plot it all at once but as I'm wrapping it up in a gui it would be nice to know if someone does decide to plot it all its not going to crash. Any way of changing the curve limit?

No, sorry.
Just an FYI, internally all data in DPlot is doubles, one for X (whether constant spacing or not) and one for Y. The amount of RAM is only meaningful up to 2Gb as DPlot is still 32-bit.