In Blitz3D a garbage collection is done automaticly. Although as far as I know it won't be affected by minimizing a window, but rather by deleting content such as images, textures, types, meshes, fonts, movies etc.
Additionally Blitz optimizes content usage automaticly, EG. when there are two identical textures with the same flags, Blitz will use instances of the first one loaded.
Additionally Blitz optimizes content usage automaticly, EG. when there are two identical textures with the same flags, Blitz will use instances of the first one loaded.