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The default rendering performance of VisIt running on some ATI cards on Linux systems has been found to approximate that of software rendering. One solution we have found to this problem is to switch the rendering mode to always use display lists, which restores the rendering performance to what you would expect from hardware accelerated rendering. To change the rendering mode to use display lists, change the Use display lists mode to Always on the Rendering options window and press the Apply button. The Rendering options window can be brought up by selecting Rendering... from the Options pull down menu at the top of the main control panel. To make the change permanent, press the Dismiss button and save the settings by selecting Save Settings from the Options pull down menu.