What is Fast Rendering and when should I use it?
A. By default, the IDV will try to adjust the data renderings to account for projection seams. This is computationally intensive in some cases and slows down the display of data. When you set your preference to “Use Fast Rendering”, the IDV will not try to account for the projection seams. If you are displaying data in its native projection, this will result in faster rendering of the data depiction. However, if you have several displays of data, each from a different data source and on a different projection, you may see anomalies in the displays (spurious lines, portions of images). At that point, you can turn off fast rendering for a particular display using the Edit->Properties menu of the Display Control for that display, or set your system preference back to not use fast rendering.
