Applications opening delays

Hi to all,
I just bought the MacBook Pro 15", the current standard model: intel core i7@2,3 GHz, 4GB ram, 500 gb HD, etc (http://store.apple.com/us/configure/MD103LL/A?)
The original installed operating system was LION and I updated to MOUNTAIN LION by appstore.
After installing Mountain Lion, I noticed many annoying delays when I open any applications.
For example, about 2-2,5 seconds (after click) to display the system preferences window, or to display the notes windows, or message windows, or whatever app windows! I don't have installed any applications, there are only the OS X apps. I am very angry because this is not allowed on a new computer.
Note: the MacBook Pro is not slow, there are only delays when I open each applications
Please, could somebody help me?
Do I format the HD and make a "Clean installation" of mountain lion?
Many thanks..

There are some things you can do to fix this. There may be some simpler things to do rather than a clean installation.
First you have to figure out what the problem is.
1. First, before you do anything, make sure you have a backup of any files you don't want to lose.
2. Make sure your hard drive is not too full. It needs some empty space (like at least 10 or 20 %) for the computer to work properly. Click on the hard drive in the finder and go to Get Info in the File menu and it will show you how full the hard drive is.
3. Take a look at Activity Monitor (Applications > Utilities), and see if there is some application or process that is hogging processor time.
4. Make a new test User account and see if the problem persists. If it does not, then you know that the problem lies in some software that you have added to your User account.
5. Similarly, try a safe boot How to Use Your Mac's Safe Boot Option which starts up your mac with a minimum of software.
6. This should keep you busy for a while. Alternatively you could go to the geniuses at your Apple Store and ask them to fix it.
7. Here is a good article on general mac maintenance and troubleshooting: Mac OS X BASIC TROUBLESHOOTING & MAINTENANCE Tips Mountain Lion 10.8 Lion 10.7 Snow Leopard 10.6 10.5 Tiger 10.4 Why How To Tutorials

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