> Many of the common complaints, such as "my computer is slow," have known solutions: registry cleaners for Windows Registry cleaners are rarely, if ever, the solution for a slow PC.
This process, even when undertaken by a non-expert removing things at random, will cause the computer to start less software when turning on and logging in, which will make it seem to be much faster.
If one of those programs was something with a large resident memory set or CPU usage then it really is objectively faster.