Why does my iMac take a lot longer to start than my Macair?

I have both an iMac 24 inch circa 2008 & a Macair circa 2010, both running OS X 10.9.2. Wnen  starting up the Macair only takes moments whereas the iMac can take three or four minutes. Is there a reason for this?  It is really not much of a problem but has me wondering.

I've done another scan of the disk and permissions repair. I had done it before but it didn't change anything.
My dropbox is full, but it was long before I had this startup problem. I became slow after an OSX update (?).
I get that kind of message on the console:
com.apple.launchd (com.apple.systemStarter) failed to count the number of files in "system/library/Startup items": no such file or directory (14 times)
and this:
com.apple.WindowServer 14:18:57 iMac de Philippe.local WindowServer... <error>: KCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint5° to catch errors as they are logged.
The next message is at 14:27:11

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