Is it worth cleaning the registry?

Question

I have heard that you should keep the registry clean on Windows. Is this actually important or is it just myth?

Answer 1

As I understand it, cleaning the registry is not going to really do much for your computer performance if anything. The registry contains thousands of keys and cleaning out a few dead ones won't really make much difference.

This forum post contains some sources that seem to confirm registry cleaning as a mythical performance enhancer.

It will have no effect on system speed. There is an excellent chance it will make your system less reliable.

Answer 2

The registry is a huge database optimized for speed. It doesn't matter if some game left its config options in there. Other programs aren't going to care and Windows can handle the memory usage just fine by paging (i.e. only loading what's needed) and other techniques.

The only time a registry cleaner could be useful is if a program was not uninstalled properly; in this case you might have some specific problem such as a broken file association. But if you are not seeing problems and are just looking for speed you are probably wasting your time. Not only that, but deleting stuff from the registry can break things in subtle or hard-to-fix ways. Hopefully a good registry cleaner backs up all its changes so that you can easily restore your old registry... assuming your computer boots properly after the cleaning.

If your windows system has lots of strange bugs that are due to registry problems you might be better served by re-installing. Before XP I used to re-install Windows every 6 months. Now I almost never have to do it. I would avoid registry cleaners.

Answer 3

I checked the Wikipedia page on registry cleaners.
Looking at Jeff's answer, maybe someone needs to update that with criticisms.

I have used CCleaner often, and in fact, also been suggested registry defragmentation tools.
Mark Russinovich, who I trust a lot with my Windows machines, also has a PageDefrag tool that works on registry hive defragmentation.

A reference to another tool by Mark called RegDevNull that helps to cleanup registry keys with embedded NULL characters.

I also often use **RevoUninstaer to cleanup after some uninstalls.
The warning from Mark and others on the risk involved with cleanup is taken seriously.

Answer 4

Not only is cleaning up the registry of minimal impact to your computer's performance, there is also a high chance of doing serious damage when attempting to do so!

I recommend NOT doing this unless you have a valid reason to do so.

Answer 5

there are few good things that a registry cleaner can do. One is removing file association to uninstalled programs for example.

But I haven't heard of any benchmark that demonstrates that cleaning your registry will increase the overall performance of your system.

Answer 6

I'm probably not a typical user, but I've never done so and never seen a need to do so. However, I do know that pretty much every program you've ever installed leaves some kind of junk lying around in your registry and/or hard drive, so it's still possible that such utilities might have a purpose.

Answer 7

CCleaner can find and remove hundred of invalid registry keys. If anything, I think cleaning the registry of invalid references can be good if you want to avoid having conflicts between software that is installed on the machine.

Answer 8

I agree, cleaning the registry risk vs reward is low, however tools to Registry defrag / compact the registry will increase performance. I use Registry Mechanic to just defrag and compact the Registry, not the registry cleaner options.

Answer 9

Well, cleaning the registry from entries virii, trojans and spyware leave there is certainly not a bad thing to do, even if regular cleaning from stale entries doesn't give much benefit.

Answer 10

I believe it's better (effort and time wise) to just reinstall the whole system every 6 months or so, than spend every once in a while cleaning registry, "keeping the system clear" with anti virus, anti trojan, anti spyware, anti ... whatever you have left.

And the whole reinstall doesn't take more than 4-5 hours, including installing all software and customizing preferences in it.