Wow, that's a true worst case scenario especially if the USB is just plain old USB 2.0 (max 480 Mbps) and/or if the drive is a spinning disk. How's the CPU doing, though? Is there any headroom given the USB bottleneck?
running top shows the process llama-cli taking 29% of CPU and 88% of memory, while process usb-storage is taking 9% of cpu and 0% of memory
running top shows the process llama-cli taking 29% of CPU and 88% of memory, while process usb-storage is taking 9% of cpu and 0% of memory