FFTW

Does HISE use JUCE FFT or FFTW? I don't know what the difference is but apparently FFTW gives better performance. I was thinking it might be a good alternative to IPP for "open source" projects.
I base my assumptions on this  https://forum.juce.com/t/jucefftvsfftwbenchmarking/18787

Yes and the convolution library I am using already has a FFTW wrapper, so the integration is trivial however IPP fully meets my current requirements so I didn‘t bother yet.

@christophhart I noticed a switch in the projucer to use FFTW, will enabling that do the trick? Or is the more behind the scenes stuff you'd need to do?