Resonance soundfield and poor performance with ambisonic files?

I have a question regarding FMOD 2 and resonance audio (and Unity).
I have some issues with the ambisonic soundfields in FMOD. When I run an ambisonic soundfile through the soundfield the performance increases dramatically to 90% - 100%. On a faster computer I could keep it under 90% for some time, but on my MacBook Pro it went into 100% immediately when playing a soundfield ambisonic file.
Do any of you have experience using soundfields and ambisonic files in FMOD 2.0 using the resonance audio spatializer?
I have both tried using pure 1st order ambix sounds as well as pre-baked 1st order ambisonic wave files, and it all pushes the performance to more than 90% using one sound. When I look at the profiler, the sound from the resonance audio spatializer is almost the only thing taking up the performance. I managed to play up to almost 150 resonance audio sound sources simultaneously with OK performance (still something like 50-60% of the CPU though), but as soon as just one single soundfield with an ambisonics file was played the performance went straight to 100%.
Are there settings I should know of in either Unity or FMOD or is this a known issue?

I really hope you can help me with this.

Hi Jenkamusic,

Is this issue only appearing on OSX? In trying to replicate the issue, I wasn’t noticing exactly what you described, but I did notice a considerable performance disparity between OSX and Windows specifically with resonance audio.
We will look to bring the performance of the two resonance audio versions closer in a future version. If the issue still persists after this update (or if you experience the issue somewhere other than OSX), please let us know.

Thanks
Tristan

Hi Tristan,
We have only tried this on OSX, and not windows unfortunately. But we tried it on three different OSX machines with different specifications.
If you make an update with better performance of the resonance audio OSX version, I would be super happy if you could let me know.

Best regards,
Niels

Hi Niels,

We have an updated version of the resonance audio plugin (OSX only) that will be included with the next version of FMOD (2.00.07). Hopefully that will address the performance issues you have been encountering.

Tristan

Hi Tristan,
That sound wonderful. I will be looking forward to this update, and promise to give you feedback on it as well. Thanks a lot for this.