I didn't know that
Anyway, one thing I have discovered is that PixInsight doesn't seem to use MultiThreads to disks for SSD Optimization, now I understand why...because not everyone has SSDs right!
I have done some bench marking and that's pretty clear, SSDs work optimally when you saturate the queues on the SSD, for example all SSD Vendors publish their performance results based on an optimal workload, usually 4K and an outstanding I/O of 16, I am using a FusionIO IO3 3.2TB PCIe adapter which are pretty much up there with the fastest Flash drives around, however the swap performance was only around 933MiBs/sec, so I have created 4 swap folders on the FusionIO Card and specified them in the Directories and Network settings in PixInsight and I am now close to 2000MiB/sec, I think I can push this futher as I am not even touching the sides on the FusionIO Card yet.
Would be interesting to know exactly how PI works at a workload level such as Block Size, Outstanding IO etc