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.” (Source)
