i was under the impression that more RAM would 100% increase boot time? i was told this by apple. My wife bought a new MB and it came with 2GB Ram, and started lots of editing on it. I installed 2+2 Gb for 4GB of RAM and it without a doubt increased my boo time. Its by means slow, but it did make the Boot time slower. I was told it would take a little more time in power on/off becuase it would need to clear the RAM on power off, and basically in lamens terms would have "to get more RAM ready" on start up. THis could be wrong, and not even close, but my boot time increased even more when i upgraded again to a total of 6GB of RAM. Later on, i would go on to fix this by upgrading my HD. Anywho, just a thought, and what i was told by a little birdie.