Windows Vista SP1 - Altering Indexing options reduce boot-time?

Hi all. I have an unusual problem; When i disable the indexing service
boot-time increases from 45 sec. to 1min50? Also, responsiveness is generally
reduced after entering the OS. I encounter the same problem while altering
(not disabling) the indexing options, i.e. selecting to only index the Start
Menu for example.
Only way to restore the PC's performance is to default the indexing options
and consequently rebuild it.

My question is if this is a known problem? Most users achieve better
performance (excluding search performance) while disabling the indexing
service. What i basically need is to reduce HD activity after boot
(Indexing/Search features keeps "hammering" my HD for almost 10min) in order
to maximize battery-life.

Another question i have related to this is if there is a way of disabling
the indexing after hibernation? In other words, can i configure the PC to
only start indexing only after dead boot and not after hibernating? This
would eventually resolve my problem.

This happens on a laptop with Business SP1 installed but i get the same
results on another laptop without SP. The hardware is working correctly and
both PCs have good configurations so this is surely software related.

I thank you for your help in advance, best regards!