After a short while of deleting, adding and updating the registry data, the data becomes fragmented, with data and free space intermingled. This makes registry access slow. Registry First Aid allows you compact the registry with easy.
The option Compact the Registry is available on Windows® 98/ME systems only. After successful registry correction the program automatically offers to the user to compact the registry.
Registry First Aid calls Windows® registry tool scanreg.exe with "opt" parameter for compacting, so this operation is as safe as Microsoft can guarantee.