I recently upgraded my 2007 vintage iMac from the Leapord OS to Mavericks. Now my system runs extremely slow when I start my apps. I only have 2G RAM. Do I need to install more RAM or is this something else?

I recently upgraded my 2007 vintage iMac from its original Leapord OS to the new Mavericks OS and now its really running slow. I've run disk utilities to confirm everything is ok from the hard drive standpoint ... but am wondering if this is simply a memory issue. I only have 2G of DDR2 SDRAM installed. Is there a minimum recommended for the Mavericks OS?  Any other recommendations?  Time to launch any app has more than tripled from what it was before the OS upgrade.

A combination of things:
1. Slower CPU and GPU.
2. Not enough RAM installed.
3. Upgraded from Leopard.
I would have backed up my files, erased the hard drive, then reinstalled Snow Leopard. Downloaded Mavericks and upgraded Snow Leopard directly. Then I would restore my files.
Upgrade your RAM to at least 4 GBs if supported by your model.
Backup your files, then do the following:
Install or Reinstall Mavericks or Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
OS X Mavericks- Erase and reinstall OS X
OS X Mountain Lion- Erase and reinstall OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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    http://support.apple.com/en-us/HT204063
    The try a safe boot:
    http://support.apple.com/en-us/HT201262
    Any change?
    Ciao.

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