The Structure View/Rendering Mode environment property allows control over the rendering speed of the Structure view.
Available options are:
Automatic - determines rendering mode based on available system resources (primarily graphics card and related driver versions).
OpenGL Hardware - force use of graphics hardware for rendering. On most systems, this will be the same as the Automatic mode.
OpenGL Software Fast - allows for proper rendering on systems that may not have advanced graphics hardware support. Rendering will be slower than OpenGL Hardware supports.
OpenGL Software Slow - another (slower) software rendering setting.
The situation is more complicated if you are running Analyst-MP remotely, via "Remote Desktop Connection". In that case the hardware and software configurations of both your host and client machines will affect the rendering speed you experience.