-75- Why does my GL application run slower on newer SGI hardware than it did on older SGI hardware?

Date: 8 Mar 1997 00:00:01 CST

  One probable explanation is that your program is using IrisGL 
  (sometimes referred to as just "GL") rather than OpenGL.  Starting
  with Impact graphics, SGI graphics hardware is optimized for native
  OpenGL.  IrisGL calls are executed through an emulation layer known
  as IGLOO, or "IrisGL On OpenGL."  This layer of emulation reduces
  performance. 

  The best solution is to port your program to OpenGL.

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