Add a global indicator (spinner, progress bar, gif) in your 'shiny' applications to show the user that the server is busy.
https://anaconda.org/conda-forge/r-shinybusy/badges/version.svg
https://anaconda.org/conda-forge/r-shinybusy/badges/latest_release_date.svg
https://anaconda.org/conda-forge/r-shinybusy/badges/latest_release_relative_date.svg
https://anaconda.org/conda-forge/r-shinybusy/badges/platforms.svg
https://anaconda.org/conda-forge/r-shinybusy/badges/license.svg
https://anaconda.org/conda-forge/r-shinybusy/badges/downloads.svg