Why do projects load so slowly?

Any theories about why Cubase is using less than 10% of the available drive bandwidth during (slow) project loads?

I have all my samples and project audio on an m.2 NVMe drive which reads at around 2300MB/s.

And yet, when loading projects with a lot of big sample libraries it loads slowly - see screenshot showing Cubase only using 104.2 MB/s of drive bandwidth during load.

So, what’s Cubase doing and why can’t it use more of the available drive bandwidth for a faster load?

Any theories?

Screenshot 2021-04-05 at 10.56.01

If you have a standalone version of the VSTi (like Kontakt) you could compare how it loads the same library vs within Cubase.