Before use, make a backup of your registry hive files and be sure you know how to restore them in the event they are corrupted. NTRegOpt), but be careful with them as some are incompatible with Vista+ and may result in an unbootable system. There are many freeware utilities to hive rebuilding (e.g. HOWEVER, defragmentation of the backing hives on the HDD is now redundant in NT 6 (Vista) and above, as the OS does it for you. The best theoretical way to boost registry performance is NOT by deleting keys, but instead by rebuilding the registry hives from scratch and/or defragmenting the backing hive files (in the case of HDDs). The best theoretical way to boost registry performance is … However, we consider these the ‘registry repair’ genre instead of ‘registy cleaner’. Some people suggest that utilities that correct keys with errorneous values may speed the system, if those errorneous values were slowing it down. Deleting a few hundred (or even thousand) keys isn’t going to make it perform faster.
Your registry is loaded into virtual memory in an optimal data structure allowing for very quick traversal (searches). Your registry has hundreds of thousands of keys. This is in line with theoretical predictions. Only rebuilding the hives from scratch (described elsewhere on this page) boosts performance. Unreleased third-party benchmarks using RegBench have shown that popular registry cleaners ran on a typical real-world PC do not boost registry performance one bit. Removal of registry keys does NOT boost performance Since registry cleaners often try to beat their competition by increasing the count of keys deleted, many tend is to be overly aggressive when deleting keys. Registry cleaners are often far too aggressive A well written cleaner will avoid mistakes, but a poorly written one will delete many important keys. It therefore has to make an educated guess. There is simply no way for a registry cleaner to know for certain whether a key is still in use or not. Many of the Application Compatibility Updates you get from Microsoft are to fix damage to critical OS registry keys. Facts about Registry Cleaners Poorly written registry cleaners cause damage
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