Really long delay booting a fresh OC 0.7.4 / Monterey

With a freshly created OC 0.7.4 EFI & config.plist my machine boots into Monterey fine - but. After initially flying through the boot process it has a very long pause of what feels like several minutes before completing the boot. On-screen the output indicates it might be related to USB (photo attached).

• ASRock Z490M-ITX/ac
• Intel i7-10700
• OpenCore 0.7.4
• Monterey
• AMD RX580
• NVMe SSD

I was initially using USBInjectAll.kext as the docs stated that ASRock motherboards needed it. However I remembered I'd previously mapped / created a specific USBMap.kext for my system's ports, so I swapped out USBInjectAll for USBMap.kext instead in the hope that might remove the long delay - sadly it didn't make any difference.

Does anyone have any ideas what might be causing the long delay please? Oddly enough it's the same at Restart too - attempting a restart closes any open apps in the usual way and then sits there for 60s plus before actually rebooting.

Thanks,

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https://preview.redd.it/zsqnnaxk36w71.jpg?width=4000&format=pjpg&auto=webp&s=3d150d93a95f9bc523ad7a9cd062655c963fb61c