Type dmesg and you will see times in front of boot log entries. Not the most proper way but you see if something is wrong right away.
This is better. There is a delay in u-boot as well, especially if you have some USB devices which are scanned, there is some boot delay by a purpose that you can break booting and get into u-boot prompt.
CPU.
You mean in the log?
### mmc0:59b4 info:
cid: 1b534d303030303010915c060100fa93
csd: 400e00325b590000775d7f800a4000a3
scr: 0235800300000000
date: 10/2015
name: 00000
type: SD
preferred_erase_size: 4194304
fwrev: 0x0
hwrev: 0x1
oemid: 0x534d
manfid: 0x00001b
serial: 0x915c0601
uevent: DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block
erase_size: 512