Shapefiles can contain a large number of points, and therefore have to potential to heavily impact the memory usage of HEC-MetVue. In order to constrain this memory usage, a Shapefile Size Threshold settings is provided. This setting defines the threshold between using a memory cached shape file, which only needs to be read once from disk, versus a more memory efficient approach which requires re-reading the shape file from disk when needed. If the threshold is set to 0, no shape files will be cached. This may be acceptable for shape files stored on local disks, but is not recommended for shape file on remote servers. Use a positive number (default is 10,485,760) to specify a reasonable threshold. Regardless of the threshold value, the cached shape file will be discarded if the program needs more memory, and therefore this settings can slow the program down, but not overload the memory.