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I'm not sure if this still current, but a few years ago I switched from LibreOffice to MS Office because Calc was unbearably slow. I wasn't doing anything crazy, but also not trivial: 6 or 7 sheets, with a bunch of formulas with never more than about 500 cells filled (10 columns, 50 lines), and on most sheets a lot less.

Excel blazes through it. I feel it was a very good decision, even though I'm a miser.

Yup. The word and powerpoint replacements are workable, but Calc is excruciatingly slow. I pity the accounting departments.

Profiling and fixing Calc perf issues happens all the time, so do file reports: https://wiki.documentfoundation.org/QA/BugReport

Did they fix the unusable slow rendering on retina Macs yet? Couldn't even normally scroll through a blank document last time I tried...

I suppose they won't use macs anyway.

Then why do they pretend they 'support' macOS and even make a build available?

I once had a bug that wiped a handful of documents. Spent hours writing them, opened them a few months later and they were blank. In some cases, it replaces all of the characters with #s. It's something to do with the autosave feature, I believe.

No fractional scrolling. No tolerable (color) templates for graphs.