Some questions about cache, Defender etc.

[PSiegmann]

Hi.

I just installed Vista.. I notice, that at the start the HD is working
heavily, and the cache increases at the same time, to the point that
the RAM is completely filled with the cache.

Can I control this cache settings?

How much is the performance penalty, if Windows Defender is active?
(core 2 duo, 2.13 ghz, 2 gb ram)

Does Readyboost makes sense?

 

[ctitanic]

try applying these two hacks mentioned here:
http://ultramobilepc-tips.blogspot.com/2007/05/make-your-vista-to-run-faster-in-your.html