The redundant data, and the invalid registry entries, can negatively affect your PCs performance.  While empty registry entries aren’t generally problematic, eventually the accumulation of them may cause a noticeable, though minute, performance lag on some computers. However, the real problem lies with the invalid registry entries — these can be the real PC-performance robbers.

Just about any program that you run on your PC receives its “directions” from the registry. These directions tell it where to find the files needed to start, and sometimes run, your program. However, if you have invalid entries in your computer’s registry, this may cause there to be multiple sets of “directions” for the same application. This is like being the driver in a car, with a navigator beside you, but two back-seat drivers telling you the “best” way to get to your destination.

The extra directions will either slow you down, cause you to get lost, or bring you to a complete standstill while you figure out what to do.  It’s the exact same thing with your computer — invalid registry entries can cause application slowdowns, system instability, and sometimes even the complete loss-of-use of a program.

All of this said — this does not mean that a registry cleaning program will speed up your computer today. It absolutely can, but that really depends on whether or not you have existing issues that would warrant the use of a registry cleaning tool.  Now, running a registry cleaner on a semi-regular basis is considered by many to be an integral part of your PCs ongoing maintenance — kind of like an oil change for your vehicle.  It’s a form of preventative maintenance inasmuch as it is a way to fix existing registry-related errors.

Bottom line — registry cleaners can cause your computer to run faster, and they can even help to prevent future registry-related problems if you use professional registry cleaning software.