Performance of tables slower than built in?

[Ola Fosheim Grøstad]

On Saturday, 25 May 2019 at 09:04:31 UTC, NaN wrote:
> Its pretty common technique in audio synthesis.

Indeed. CSound does this.

> What i've done in the past is store a table of polynomial 
> segments that were optimised with curve fitting.

That's an interesting solution, how do you avoid higher order 
discontinuities between segments? Crossfading? Or maybe it wasn't 
audible.