Normal conversion speed from Aperture to Capture One?

Normal conversion speed from Aperture to Capture One?

Hi,
I have a 600GB Aperture library that I am converting to Capture One after all these years.  Retroactive kept things limping along, but I finally purchase Avalanche to migrate the library.

I noticed that briefly, my 10-core i9 iMac was running at about 500% when the conversion was kicked off.  But now it is limping along at about 5% CPU utilization or so for a few hours.  The size of the new library is about 80MB (yes, not GB).  The target is a QNAP NAS with enough space for the new library (the original is on a Thunderbolt-connect SSD drive).  I've copied massive files to the QNAP before without being such a bottleneck.  If I could create the new library on the same drive, I would.  There's just not enough space.

The network utilization is a small - with about 500KBs constant upstream flow (on an uncongested GbE link).

Any ideas?  The version of Avalanche is 1.4.5 Build 1516.  Capture One 23 16.2.6.7.  MacOS Sonoma 14.2.1