What would cause my iMac to be slow to start up?

My iMac (intel) has become very slow to start up. Sometimes I have to shut down and try the start up a second time before it will complete the start up.

Hi..
Not enough free space on the startup disk can cause your iMac to slow down over time.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.
iMac, Mac OS X (10.5.4)
Remove any items in System Preferences > Accounts > Login Items
Same for /Library/StartupItems

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http://support.apple.com/kb/ht1573
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What would cause my iMac to be slow to start up?

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