I own a HP ProBook 450 G5 Notebook PC, with Windows 10 the startup HP logo stays less than 5s whereas with linux distributions it stays more than 15s, I've tried Ubuntu, Linux mint, Linux lite, but the results were unchanged.
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I have an HP Probook 440 G7 running Ubuntu 20.04.4 and takes 29 secs from switching on to reaching the password prompt. I've been unable to shorten this despite extensive research, changing settings in BIOS and disabling the top line using systemd-analyze. I'll live with it!
Since Windows cheat with their start up, if you want to see a comparison with another OS, just turn off fast boot in BIOS and you'll find Windows much slower to get to the login screen. Fast boot just puts Windows into a "hibernation" state ensuring a quick start up.
More research and using dmesg -T > /tmp/myBoot.txt; gedit /tmp/myBoot.txt I find that waiting for the ipv6 connection is taking 9-11 seconds.
I'll do more checking to see if it is wise to disable ipv6.
Unfortunately I am unable to reach a decision as there appears to be no definitive answer.
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