JetSearch doesn't seem to search the entire drive as Everything Search does. It is much faster if it would only find all copies that you search for.
Examples below:
search: shell32.dll
Everything search 48 entries
JetSearch 44 entries
search: ExplorerFrame.dll
Everything search 30 entries
JetSearch 26 entries
These are just two of the 15 I checked and Everything search always found more entres.