Author here. I made this demo and a related matrix-matrix multiplication demo [1] back in 2015 for Robert van de Geijn's Linear Algebra: Foundations to Frontiers MOOC class [2]. In the light of Spectre attack and recent browsers' changes to reduce precision of timers, I remembered of this project, and decided to check if it still works now, 3 years later. Surprisingly, it still works well!<p>The source code is available on GitHub [3].<p>[1] <a href="https://maratyszcza.github.io/laff-demos/dgemm.html" rel="nofollow">https://maratyszcza.github.io/laff-demos/dgemm.html</a><p>[2] <a href="https://www.edx.org/course/linear-algebra-foundations-frontiers-utaustinx-ut-5-02x" rel="nofollow">https://www.edx.org/course/linear-algebra-foundations-fronti...</a><p>[3] <a href="https://github.com/Maratyszcza/laff-demos" rel="nofollow">https://github.com/Maratyszcza/laff-demos</a>