Here's a blog post benchmarking eigen and Boost UBLAS ( we were using boost ones previously ) and is upto 80x better. We are using Eigen in LibreCAD 3 and hence performance will be better in v3 as compared to v2.
https://attractivechaos.wordpress.com/2016/08/28/optimizing-matrix-multiplication/Regards,
Gaganjyot
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