More Tests:
I used MLVApp 1.0 & 1.8 versions from download page:
Same Clip , Same settings , Exporting to Apple Prores 444 , 30 Seconds Clip , 23.976 FPS , 1736x976 , 14-bit Lossless
MLVApp 1.0 :
Bilinear Exporting took 28 Seconds
AMaZE Exporting took 42 Seconds (was Using 60% CPU)
MLVApp 1.8:
Bilinear Exporting took 36 Seconds
AMaZE Exporting took 1:23 Minutes (was Using 34% CPU)
**Dual ISO , 6 Seconds Clip , 1736x868 , 14-bit Lossless , 23.976 FPS , Exporting to Apple Prores 444:
MLVApp 1.0 : AMaZE Exporting took 31 Seconds (was Using 46% CPU)
MLVApp 1.8 : AMaZE Exporting took 1:28 Minutes (was Using 9% CPU)
It's okay for Dual ISO I remember some
problems happened when we were
using openmp for Dual ISO and after then
bouncyball disabled it from source. **
If your system was always 100% CPU in both MLVApp versions I don't think you will see a difference , you need a faster CPU than MLVApp needs for these versions , we should look back at what made MLVApp slower

(Color Matrices doesn't affect the performance)
I will try the other versions of MLVApp to find out what the exact version the slow appeared . .
Edit:
MLVApp 1.4 Okay not affected
MLVApp 1.6 Okay not affected
MLVApp 1.7 Okay not affected : Same 30 Seconds clip above : AMaZE Exporting took 42 Seconds (was Using 60% CPU)
The
slow speed happened in the last release only which is 1.8 (bad commit affected the speed ? ) , switching back to 1.7 for the speed

(I think MLVApp 1.7 will give 16 FPS AMaZE playback in my case , @masc I will shot a video MLVApp showing 16 FPS AMaZE without caching).