Adaptive degradation is a way to control performance of effects as you use them. 
To enable Adaptive Degradation and Performance Tuning Dialog Box 
- Right-click in the drawing area, and choose Preferences. 
 
- On the General tab, under adaptive Degradation, select Automatically decrease display quality to improve performance. 
 
Note: Controls whether adaptive degradation is on or off. With adaptive degradation on, if performance goes below a specified level, effects are disabled or reduced to maintain an acceptable level of performance. 
 
Set the Performance Level for Adaptive Degradation
- Enter -3dconfig at the Command prompt to use this command. 
 
- Select Acceleration from the options shown in the command prompt. 
This specifies whether to use software or hardware acceleration in 3D. 
  
- Select hardware to set the required options.