"System reads everything in a given reg folder - good and bad - uses cpu time - after while you notice it in your system..." This is absolutely not true. The only thing read is what needs to be read, noting more and nothing less. The registry is order in such a manner (partial hash with a linked list) that searches a very quick. It is not searched from end to end (linear search). Read a book by a compentent authority to verify my statement. I have never used a registry cleaner since Windows NT 4.0, I have not any performance issues!