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Hundreds of thousands, I think you're right and a table is the only way to speed up the process

I'll try this as solution but the logarithm still takes part. Don't know whether I can get better response times

Yes release mode with optimization at "Favors fast code"

Just a little faster, but they are both slow :(

In my previous post I figured out (thanks to D_Drmmr) how to calculate arc cosine with real numbers (including numbers not in the range -1;1).



_acos =...