i believe by rebooting the phone for a few times during the first 24-48 hours after the update will improve the booting time. yeah when i've just finished updating, it took like 3+ minutes before the lock screen appeared but then i did my first manual reboot after 1 hour, the booting time has reduced to around 1.5 minutes and just last night i took my manual reboot again and this time, it was 57 seconds and the Hub loaded like in 10 seconds, very quick!
so i suggest for anyone of you who are still having the slow boot up time, train your Z30 by doing the manual reboot for 2-3 times during these days and it will be tamed again
and.. for the SIM PIN lock, aah thanks for the input. my dad will go & buy the Q10 after he heard that now the 10.2.1 has rolled out (he refrained from getting 1 last year as no group SMS/email support for BB10 prior to 10.2.1 but now, there is no reason for him to refrain

) but i'll advise him about this SIM PIN lock which will delay the boot up. thanks for that!