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Slow boot when choosing startup disk

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Hello guys!

I've recently acquired a 2009 Mac Pro and have been making some upgrades to the machine.

My current setup is:
  • PCIe SSD with El Capitan
  • SATA SSD with Windows 10
  • 1TB internal SATA spinning drive
  • USB 3.0 card
  • Two optical media drives - Superdrive, and a Blu-ray drive

I've been having a problem that when I hold down option when I hear the chime, I'm presented with a grey screen for 15-20 seconds. Then the list of bootable drives shows up. When I boot...

Slow boot when choosing startup disk

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