Before login page start 6sec extra takes

Hi developers

when bootloader boots 6sec extra takes before star login page how to remove this time bellow copied grabserial captured time please any one developer answer me hopefully I am waiting for reply

[21.436136 0.235720] [ OK ] Started Login Service.

[21.619567 0.183431] [ OK ] Started OpenBSD Secure Shell server.

[22.057817 0.438250] [ OK ] Started LSB: Load kernel modules needed to enable cpufreq scaling.

[22.103397 0.045580] Starting LSB: set CPUFreq kernel parameters…

[22.477003 0.373606] [ OK ] Started LSB: set CPUFreq kernel parameters.

[23.067155 0.590152] [ OK ] Found device /dev/ttyS0.

[23.100613 0.033458] [ OK ] Started Serial Getty on ttyS0.

[23.115977 0.015364] [ OK ] Reached target Login Prompts.

[29.139019 6.023042]

[29.151516 0.012497] Debian GNU/Linux 9 ttrhvt.0941 ttyS0

[29.154867 0.003351]

[29.154939 0.000072] BeagleBoard.org Debian Image 2017-08-31

[29.158610 0.003671]

[29.158696 0.000086] Support/FAQ: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian

[29.164656 0.005960]

[29.164743 0.000087] default username:password is [debian:temppwd]

[29.168920 0.004177]

[29.174534 0.005614] ttrhvt login:

please tell me i am waiting for your replay

thanking you