[wander_homer]

Recoll serves a different purpose as it's primarily build to index and search within your personal documents. That's why it doesn't work well when you point it to the root folder, in an attempt to search within the entire system of millions of files and that's also the reason why it's not as fast, since it's doing more work (parsing complex file formats, searching within a more complex database structure and more data, ...).

FSearch is primarily built to find files on the entire system instantly (by that I mean that all results should be ready by the time you press the next character while typing), based on their name, size, time, filetype, etc. This is less work than what Recoll does and that's why it is much faster.

That's why I also use both tools.

[Beijinger]

"FSearch is primarily built to find files on the entire system instantly "

I am not sure, but I think my Bodhi "everything starter" solves this problem for me. If I look for something more specific, I use recoll.