There is no performance cost. It boots your rootfs/kernerl/initramfs natively.
As for SSD usage, your rootfs will never be written to (read only with tmpfs overlay), only reads. You can mount partitions normally with fstab, which can be on SSD, or w/e drive you'd like.
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[ 4.4 ms ] story [ 22.3 ms ] threadAs for SSD usage, your rootfs will never be written to (read only with tmpfs overlay), only reads. You can mount partitions normally with fstab, which can be on SSD, or w/e drive you'd like.