Floating-Point Arithmetic performance

Hi. I am working on a DAW app, music production app with a lot of floating point arithmetic processing for both Windows devices and Android.
At the beginning it seems to have good performance but now I realize that the windows devices runs maybe 5 times faster than Android with equal CPUs.

And I saw this page:
https://developer.xamarin.com/guides/android/deployment,_testing,_and_metrics/performance/#avoidfloats

So what do you guys say? Is the floating point arithmetic so slow so it would be better to do all the heavy processing in a C++ library?
How do you guys test the performance? I am using the visual studio built-in profiler for Windows to find all the slow code and it has help me a lot to increase the performance (On windows devices...) Is there any good trix to measure the prformance on android? Or is the old school logs the best?

:)

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