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RAM won't really affect bootup time. During bootup, your Mac is putting all of it's effort into reading the hard drive, and talking to every hardware component in your computer. 1gb of RAM or more will ensure RAM isn't limiting your computer's bootup time.

RAM affects how well your computer behaves when it's actually booted up. Unless you have fast-user-switching enabled with two or more user accounts, or are using something like Logic, Final Cut Pro or Aperture, I would expect there to be much difference between 2gb of RAM and 4 gb of RAM.

I run 2 gb of RAM in both of my Macs and never really find it limiting, even with quite complex recording projects.
 
Did you enable FileVault? FileVault is great for security, but adds some time on startup and logging in as your user because OS X has to check the sparse bundle's integrity and mount that filesystem under your home directory.

Also, are you using some antivirus program? Some might cause the machine to slow down, compared to before it was installed.
 
I haven't timed my 2 GHz MB but 40s sounds excessive. Are you talking about booting up after a shut down?
 
Just onyx and run it a few times. i have been using this app for a while and i dare say my macbook is faster then when i bought it.
 
Probably due to Microsoft Office 2004

I have been trying to track this down for ages.

This message happens after I installed them removed Microsoft Office 2004 on a brand-new Intel MBPro.

Other Console messages and Crash reports related to bus errors which happen in launchd while itis processing com.apple.Dock are 99.99999% certainly due to Office 2004 and its totally fubar'd installation processes.

I would be very glad to correspond directly about this --- cb0 at ME dot com

CB
 
Some Macs slow more noticeably than others. Although RAM doesn't directly affect boot time, 4GB will take slightly longer than 2 or 1GB to detect and prime during boot, though we're talking a second or two at most. The more data on your hard drive, or a recently (re)formatted hard drive will take longer to boot as more data relevant to start up procedure has to be found over a wider area.

One way to ensure your hard drive is indexed neatly is to leave your computer on overnight, and it will automatically run disk cleanup utilities. My Mac Mini shaved a whole 5-8 seconds off its boot time after I left it on overnight after being shown this by another member.

Reducing the number of Login Items (that is, apps that boot immediately as the computer completes its boot procedure) can also dramatically boost performance.
 
So it takes 40 secs to load up on ur Imac too?

Ahh.... i was just worried because with 4 Gigs of ram... i would of thought tihngs would be running a bit faster....

My new WhiteBook usually takes about that long and I have 4GB's of RAM and I run maintenance scripts on a regular basis. It's perfectly normal to take 40 seconds to boot up. From what I hear, boot times will be a LOT shorter with Snow Leopard because Apple is pulling the plug on their support for the Power PC platform.
 
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