still amazing yet helm-org-rifle-org-directory and helm-org-rifle-occur-directories really slow

Hi again

so im loving helm-org-file and have been using it alot over the past year or so. one thing that is constantly breaking my fast workflow are commands that work on directories such as `helm-org-rifle-org-directory` and `helm-org-rifle-occur-directories`. these can take a *long* time to load from the time you issue the command until it asks for input. i saw today with the latest ivy release that he included ripgrep for searching with is blazing fast. I was wondering if we can have something like that in helm-org-rifle?

thx alot again for your amazing work!

Z