Is it the one from the package snap2stamps ?
Oh I just saw the link.
From the monitoring tool, I can see that snap is using more than 30 Go of RAM and from 60 to 80% of the processor while processing …
Despite the use of the consequent ressources, it takes a long time (>2 hours for a single pair) to compute this step while in my memory, it was between 5 and 10 minutes … As indicated in this post : Processing time for stamps export