Thanks for your response @max.krummenacher
I have follow your guide to boot time optimization but now display a error
root@apalis-imx6:~# systemctl status systemd-modules-load.service
systemd-modules-load.service - Load Kernel Modules
Loaded: loaded (/lib/systemd/system/systemd-modules-load.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 1970-01-01 00:00:02 UTC; 45 years 10 months ago
Process: 117 ExecStart=/lib/systemd/systemd-modules-load (code=exited, status=1/FAILURE)
Main PID: 117 (code=exited, status=1/FAILURE)
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.
I want to deactivate the init below, but have no idea. Do you have hints for me ?
[6.011526 0.019287] [ OK ] Reached target Login Prompts.
[6.036299 0.024773] [ OK ] Started LXDE Display Manager.
[6.042357 0.006058] Starting LXDE Display Manager...
[6.094269 0.022777] [ OK ] Reached target Multi-User System.
[6.111731 0.017462] [ OK ] Reached target Graphical Interface.
** Here is my current complete boot up, have you more hints to reduce boot time?