Based loosly on Leatrix's GFX addon, this is more versitile. It doesn't load 16 bit graphics, but it does allow you to change multiple graphics settings with an ingame slash command, based on what zone you're in, or to automatically load different graphics settings when you move between zones.

To install, extract the Lagbuster folder into your addon directory.

To Customize your settings, there are a series of options for the /lbust slash command (Or just use the configuration GUI):

The current slash command options for the /lbust slash command are:

/lbust config : This pulls up the GUI customization controls, which let you change
and update settings without having to use most of the other slash commands.

The GUI contains the following:

Four Radio buttons ("None", "Average", "Bad" and "Very Bad")
These will set the current zone's default setting to whichever one you click.
A checkbox to autoload* settings when you change zones.
A checkbox to "undock" the "Restart Graphics" button, so that it will
pop up automatically when you move to a zone with different graphics
settings from the one you left. The floating button can be dragged
anywhere on the screen with the right mouse button, so it pops up where you want it.
A Restart Graphics button to manually restart WOW's graphics engine
when the autoload settings function is active.
This can be undocked and moved wherever on the screen you want it
to pop up when you change zones to one with different settings.
A "Load Variables" button: This one is to be used after you enter WOW's
graphics console and change the settings, to load the current active
graphics settings into whichever preset has it's radio button checked.
This is used to fine-tune the settings for the presets.
All it does is read the active console variables settings and save them
into the current preset slot.
An "Apply Settings: <Setting>" button: This is used if you don't have the
autoload option turned on, to load the settings for the current zone.
A separate, hideable CVAR panel, which shows the current console variable settings.



The manual slash command options (for those who don't want to use the GUI for everything)

/lbust zone: Force-load zone-based graphics settings (use this if the addon is being stubborn)
I added this when I discovered that, for some reason, the slash command would
sometimes not load the local settings automatically.
/lbust up and /lbust down: Load and apply slightly higher (or lower) presets.
This lets you find the right preset for the current zone before locking
it in with the setzone command.
/lbust min and /lbust max: Load and apply worst (or best) graphics presets.
/lbust res: List the available screen resolutions Lagbuster is using.
The resolutions that Lagbuster picks are based on whether you have set
Lagbuster for a widescreen or normal screen monitor.
/lbust wide: Toggle between widescreen and normal resolution defaults.
/lbust cvar: list the current active values of the variables Lagbuster affects.
Users can use this to figure out which variables to customize.
/lbust set: Tells the addon to set the current preset to whatever the current
active graphics settings are. To customize a preset, make it the active
one using the up/down min/max commands, and then open WOW's interface
options and edit the video settings until they are the way you want them,
then use /lbust set to lock them in. If you ever want to go back to
Lagbuster's presets, delete the lagbuster saved variables file in the
WTF/Account/<ACCOUNTNAME>/SavedVariables folder.
/lbust setzone: Tells the addon to set the current zone's default setting to the
currently active preset. Use the up/down min/max commands to select the
preset you want, then use /lbust setzone, or simply click the setting radio
button you want in the config window. This does not apply the new settings
unless you have autoload turned on, it only sets the current zone's default.
/lbust auto: Toggle's Lagbuster's automatic* graphics adjustment option.


* Automatic zone-based changes:

WARNING: When this is active, it will change your graphics whenever you move between zones that have different graphics settings. It should not restart your graphics engine (often - for some reason I can't figure out yet, it still restarts sometimes anyway) until you open the config panel and manually click the Restart Graphics button (Or click it, if it is undocked to pop up.) If Auto is NOT active, you must type /lbust or click the Apply Settings button in the config window to apply the new zone's preset. If this is active, it is wise to avoid combat near a zone boundary, in case the graphics engine restarts spontaneously when you cross the zone boundary.

1.00 - Fixed the file so it has a folder and a readme.txt.
1.01- Fixed an issue with view distance not updating, and moved the attention sound to the zone changed condition so it doesnt happen every time you change the settings, only when you change zones. Also, the zone settings loading alert and sound should now only play if the new zone's settings differ from the active ones.
1.02 - Made the formatting on the addon's printouts a bit more readable, and fixed some errors in the source code comments. Also added some error messages and improved the flow control a bit.
2.00 - Total Rewrite. Added a GUI interface, accessable by the "/lbust config" option.
2.01 - Fixed an issue with the current zone not being properly updated in the configuration screen, and made the interface a bit prettier.
2.02 - Added some more features, like making it so that autoupdate doesn't automatically restart the graphics engine upon moving to a zone with different settings. Now graphics restart is handled by a button on the config panel. The config panel is also dragable now.
2.03 - Clarified the page title, and added the ability to detatch the "Reset Graphics" button so that it can be moved around the screen and will "Pop up" when you enter a zone with new settings available, so you don't have to pull up the configuration screen to reset your graphics.
3.01 - Updated for patch 3.2 and made the reset button dragable with right button.
3.02 - Spent several hours narrowing down the cause of the "Graphics restarting when zoning and not on demand" bug. You should now no longer get loading screens when moving between zones.