There are two likely reasons: First, the \\"Use type-ahead search\\" option in the preferences can have a significant impact on performance. If it's enabled, try disabling it. Second, it's possible that you have indexed one or more very large folders, and that these folders are being frequently modified in the background, triggering continuous index updating in DocFetcher Pro and thus slowing the latter down. In that case, try turning off automatic index updating on all indexes. To do so for a single index, right-click on it in the Search Scope pane and uncheck \\"Auto-Update Index\\". Alternatively, you can disable automatic index updating on all indexes at once by launching the program with a --disable-auto-index-update argument. The page \\"Index Updates\\" in the user manual explains how DocFetcher Pro's automatic index updating works, and what the alternatives are when automatic index updating is not available.