I've been making halftones in inkscape. The current one I'm working on uses .100mm circles, that are so dense that if I filled up the page, it would be over 3.4 million dots. Inkscape keeps crashing on me, I can't even duplicate the 157,000 dots I have right now without it shutting down.
I've been making these manually, using the distribute functions and the group function.
I've tried making a pattern, but Inkscape seems to have an issue when I make patterns.

The pattern on the top is a pattern, and the one on the bottom is done manually.
Any suggestions? I should mention, that the version of Inkscape I have is over 3 years old (though I don't know the version number.) If the pattern issue or anything that relates to what I'm doing is fixed in any newer versions, please let me know.