Free Registry Defrag/Compact is an application (or website) that allows users to improve their system performance by reducing the size of their registry files. It does this by reorganizing and compressing the registry, which can help to speed up start-up times and system performance. The defragmentation and compaction features can also help to reduce system crashes and errors. It can also be used to improve the security of the system by eliminating unused registry entries. It is also a great tool for backing up the registry, so that if something goes wrong, the user can easily restore it to a previous version.
Discontinued No longer updated. The last version was released in 2011. See https://www.little-apps.com/little-registry-optimizer/