Macbook Air 11  Late 2010 - Slow start up times

I used to have a start up time of around 10-15 seconds with my mb air (11 inch 4gb ram core 2 duo 1.6 128gb SS). Now, it takes 40-50 seconds to fully load it.
I've done the ff
1) verified and fixed permisions
2) used clean my mac
3) used onyx
4) ensured that my hard drive is the start up drive ( start up disk)

Safe boot always takes longer because it checks the drive, clears caches, etc. Perhaps using Snow Leopard Cache Cleaner to clear out all your user, system, and font caches will help. As will doing this:
Repair the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

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