Here are all the boot times on my system.
I measured from boot start until the cool background first appeared. (Did not wait until the end of the Amikit splash screen)
Amikit Linux 32 bit boot time 8.36
Amikit Linux 64 bit boot time 11.28
AMikit Windows 32 bit boot time 5.03
AMikit Windows 64 bit boot time 8.26
One more remark: Using Amikit and then change to e.g. to a browser, then back to amiga made the mouse not being trapped again in amiga mode.
Changing the «Mouse untrap mode» in Settings->Host->Game port to «None (Alt-tab) helped.
Now I can change back from Amikit, check something on the net and change back to amikit again without problems.
Update: I was once able to reproduce this problem even with this setting. But works most of the time...