Lag during Clover boot due to 'dataless_snapshot' / APFS issues?

I have had a golden hackintosh build for some time now, and just recently my boot time has consistently become slower and slower every time I boot.

I booted with -v, and it seems to be hanging on some kind of issue with APFS snapshots. Here is a screenshot.

It boots like normal in the end, but not after this sluggish period that adds on about an extra 60 seconds to the total boot time. The only thing I changed recently was upgrading to a Samsung 970 Pro which I installed in an M.2 slot on my motherboard.

Any ideas what's happening?

My specs:

• High Sierra 10.13.6
• Gigabyte Z390 Aorus Master
• Intel i9-9900k
• 64gb Corsair Vengeance LPX RAM
• Nvidia GTX 980Ti
• 1x Samsung 970 Pro 1TB (boot drive)
• 2x 240GB SSD
• 1x 4TB HDD