replaced HDD with SSD because slow boot ,boot is only about 2X faster than HDD!!
25 seconds from pressing the power key to the login screen
core-i5-4310U 2GHz - 8GB Ram DDR3
systemd-analyze blame using HDD :
systemd-analyze blame using SSD :
commands in how to decrease the boot time just decreased time in systemd-analyze and boot time with stopwatch has no changes
I removed snap ,disabled NetworkManager-wait-online.service
using systemd-analyze startup takes 7.683s but but 25s to viewing login page .
