File system traversal can be quite slow on traditional hard disk drive, it requires a lot of random disk access which has much higher latency than sequential ac

File system traversal can be quite slow on traditional hard disk drive, it requires a lot of random disk access which has much higher latency than sequential access (think about the moving parts in the disk drive). So I guess that being written in Python is hardly the bottleneck if the disk reads have not been cached by the kernel.