I have several issues since I upgrade to mavericks 2 weeks ago. Graphic Artifacts on screen and trouble with the finder (sometimes not responding). .

Imac  21.5 pouces, mi-2011 -  2.5 GHz Intel Core i5 - 4 Go 1333 MHz DDR3 - AMD Radeon HD 6750M 512 Mo - OS X 10.9.1 (13B42)
Everything was perfect before (when I was on lion). Now I have problems with mavericks (like many other people) and I regret my upgrade ... I hope Apple will provide system update to correct all this.

xcalabadawg wrote:
System Software:
          OS X 10.9 (13A598) - Uptime: 11 days 4:36:46
One thing I consider interesting from your post is that you are not using the OS X Mavericks version released in the Mac App Store last month. Instead, you are using the OS X Mavericks Golden Master, which is 13A598. The final OS X Mavericks version is 13A603.
Looking at this, the best thing you can do (as you said) is to reinstall OS X, so you can get the final OS X Mavericks version. As you are going to do this, this is the best time to erase the hard drive.
You can reinstall OS X through OS X Recovery (holding Command and R keys while your Mac is starting up). Erase the hard drive with Disk Utility > http://pondini.org/OSX/DU1.html Then, close Disk Utility and reinstall OS X. Your Mac should be working properly.
Make a backup of your files before erasing the hard drive. I recommend you to copy your most important files to an external drive and restore them manually, apart from reinstalling all your applications manually.
Apart from that, I see that Firefox is taking up 1 GB of RAM on your Mac and that you have only got 291 MB of free RAM, which may be the issue

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