It seems, there can be also problem with number of your cores. 8 cores * 2 hyperthreading * 4 gb of ram per thread = 64gb ram for a good performance in high compute calculation. Otherwise it is swapped on C disc.
Also, could you test disabling 4 cores/ 8 threads or disabling hyperthreading in your BIOS? and turn the reconstruction test again?
One more thing I would try is to manually set windows swap to 150% of your current RAM so you would have 32GB+ 150% on windows swap (keep in mind to use an SSD disk for that when you will all the time have at least 50 GB of storage left)
How To Manage Virtual Memory (Pagefile) In Windows 10 | Tom’s Hardware
The minimum and maximum size of the Pagefile can be up to 1.5 times and 4 times of the physical memory that your computer has, respectively. For example, if your computer has 1GB of RAM, the minimum Pagefile size can be 1.5GB, and the maximum size of the file can be 4GB.
By default, Windows 10 automatically manages the Pagefile according to your computer’s configuration and the RAM present in it. However, if you ever face lagging while working on Windows 10, or you start getting the PAGE_FAULT_IN_NONPAGED_AREA or KERNEL_DATA_INPAGE_ERROR Blue Screen of Death (BSOD), managing the size of the Pagefile manually is the first thing you should look for.
And one more thing, there is new [pre-release](Redirecting... tn =-UK-R&c%5B0%5D=AT2bxJOa48xog5do4fQfWTChoBbkFmVhZmSlg7E-3rVepvfcxjxIGZFo5Mf_ZUkHTesdeqZzA_Ifo1HOptIrsnn_zS5l-jMMYJkKkbxpawX5QjRkw0bAPueQkZRLLpoptTxn5ngjSFdXKVJSURVXdXi7jV_EsmmWt-o), which has different way, how to compute model. You can try it, but it is just pre-release.
Regarding to the video, can you upload it on Wetransfer and send me a link to it?