Running 9047-beta16 on an RT-N16 I've noticed that sometimes there's an extra delay when booting. My test router has a serial console cable so I was able to see where the pause is and it seems to be while loading the "et" module. Sometimes the delay is only 3 seconds, sometimes 43 seconds. It's only a minor annoyance but I thought I'd report it in case someone else runs into it. If you didn't have a serial cable you might think you bricked your router.
VFS: Mounted root (squashfs filesystem) readonly. Freeing unused kernel memory: 112k freed Warning: unable to open an initial console. *** Delay here, sometimes 3 seconds, sometimes 43 seconds *** et: module license 'unspecified' taints kernel. PCI: Setting latency timer of device 0000:00:02.0 to 64 eth0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 18.104.22.168