This information is in reference to the Graphics changes mentioned in the 3.3.0 Patch notes.

We have added a new experimental feature to the D3D graphics engine to improve texture management (particularly on Windows XP). This is currently enabled by default on the PTR and can be reverted to the original behavior by adding the following line to your Config.WTF file:

SET gxApi "d3d9"

Also, the configuration variable ‘textureCacheSize’ is no longer used with the new backend. To set the cache size for the new backend, adjust the ‘gxTextureCacheSize’ variable. For example, to allow 128MB of GPU memory to be used for textures, add the following line to your Config.WTF file:

SET gxTextureCacheSize "128"

If ‘gxTextureCacheSize’ is set to 0, the client will try to pick a reasonable default value for your settings.

Please let us know about your experience with the new backend.

Thank you everyone for your input so far. I'd like to remind everyone that if you are experiencing issues after making this change to your config file, to please report it on the forum in a new thread.

Also, when posting the issue you're having, please include a DXDiag file in your post. For information on how to get your computers DXDiag, please see the following:

To obtain a DXDiag:

• Click on the Start button and select Run. (For Vista Users, press the Windows Key (the key with the Windows logo on your keyboard) + R (at the same time) and skip to step 3)
  
• In the Open: field type in dxdiag and click the OK button.
  
• Click Save All Information, then open the file and copy the information into a single post (as much as is allowed).
  
  To obtain a System Profile:
  
• Click on the Apple at the top-left of your OS and select About This Mac, then More Information
  
• The System Profiler should open. Save all the information as a Plain Text or RTF file, then open it.