A triangle strip is a series of connected triangles from the triangle mesh, sharing vertices, allowing for more efficient memory usage for computer graphics. They are more efficient than triangle lists without indexing, but usually equally fast or slower than indexed triangle lists. The primary reason to use triangle strips is to reduce the amount of data needed to create a series of triangles. The number of vertices stored in memory is reduced from "3N" to "N+2", where "N" is the number of triangles to be drawn. This allows for less use of disk space, as well as making them faster to load into RAM.