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Eusing Free Registry Defrag is a free registry defragmentation software that optimizes registry by removing gaps, fragments and wasted space in Windows registry files.
Over time the registry becomes larger and larger as new programs are installed, used and removed. Even if this data is deleted from it when applications are uninstalled, the size of the Registry will not decrease. This is because the data will be marked as blank but remains in place. In this way the registry becomes more and more fragmented over time. Registry fragmentation causes overall system performance to decrease. Systems with a fragmented registry will take longer to boot and will use more memory just for processing the registry, resulting in decreased overall performance as other programs are forced to use much slower virtual memory.