RAMRush is a free program, which serves to optimize system memory usage, freeing up RAM and preventing system crashes. The software is user-friendly, makes use of few system resources, includes an auto-optimization feature and can be set to launch automatically on start up. It is unobtrusive and will free up RAM when necessary, which can be extremely valuable on older computers, where RAM is limited. However, on more powerful machines, running modern operating systems, it may actually be counter-productive, increasing app start up times.