Over the past few days, I have been using the newest release of PixInsight (1.8.8.3) on Windows, using a stable system that has worked well over the past several years. I was able to use MMT, with 8 layers, noise reduction, a linear mask and all worked well. But then I increased the value of adaptive under Noise Reduction to 4 of the 8 layers. I set layer 5 adaptive to 2, and for layer 6 and 7 adaptive to 3 and layer 8 to 2. When I do this, my system seems to hang and I have to kill the process. I have not let it run over night yet, but it churns at 99.5% for a couple of hours before I finally killed it.
as a test, I opened a clean project and opened an RGB image. I set the MMT process like above, but I left all the Noise Reduction Adaptive values at zero. This worked fine. Then I set layer 5 adaptive to 2. It did not hang, but ran 30 seconds or so before coming back and the process console only popped out at the very end. Then I set layer 6 adaptive to 3 and this time, it took several minutes before it came back. Again, the process console pops out only at the very end.
So it appears as I add more layers using adaptive and/or increase the value of adaptive, it takes longer and longer. And I did not keep going, but at some point, once I set adaptive on layers 7 and 8, it takes hours and I assume it will never come back.
I have never set a value for adaptive before, so this may not be a new "problem". But since I just ran into it, I thought I would share to verify this is known to requires a LOT more time as you increase the number of layers with a non-zero value for adaptive or increase the value of adaptive itself.
