Comment 4 for bug 1852082

please keep this report for one issue only. The zone recalculation speed should go into a separate report.

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Also the fact that you write to a sata disc does not guarantee the fp cache to be generated fast. If kicad thinks the footprints have diverted significantly then the whole cache is rebuild which can take some time depending on how many libs and footprints you have (even with fast hardware) It is just more noticeable with slow hardware. Maybe check if the fp cache is changing while pcb new is behaving this strangely (not sure if your operating system has a way for a user to check directly if a process touches a file right now. Otherwise you are limited to seeing changes to its file size or updates to its modified date)

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If the fp cache is not to blame then there is some other issue at hand. (fp cache is just the first thing that comes to mind as it is something that can lock up closing of pcbnew)