On 07 Apr 2016, Keith Nuttle wrote in
alt.comp.os.windows-8:

will it run the test sheet that I proposed in a couple of seconds?
normal curve

Or is it still excruciatingly slow.

I don't find LibreOffice Calc to be slow, though I haven't stress
tested it. I have found some disappointing differences in functions
between it and Excel that would make interoperability a problem.