I can't remember all the details, but it either disables display lists entirely or cuts back on them. Display lists are an OpenGL technology designed to speed up the rendering of static geometry. Since LDView is just a viewer, all the geometry it draws is static, and it creates a display list for the entire model when in "High" memory usage (as well as a separate display list for each part).
It's been a while, so I can't remember for sure, but I think the settings are like so:
It's been a while, so I can't remember for sure, but I think the settings are like so:
Code:
High: One display list for each part, and another for the whole model.
Medium: One display list for each part.
Low: No display lists.