Some things to do to speed up booting times can be found here:
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=5445&forum=14&20Good targets for AOS4dev/pre:
Cold boot 38 seconds
Warm boot ~12 seconds
Update:
Explanation for things like: "I have 512MB of RAM in my AmigaOne, and about 124MB displayed on bootup." can be found @ amigaworld.net .
(there was a bug that was avoided by limiting the available memory, bug is now fixed and the limitation is gone, but it was done a few days later than AOS4devpre gold CD ... etc...)