Antolius@dansup hashing & preventing duplicates is ok.
But perhaps you could also inject a placeholder post (with a processing status?) into the home feed? Just on the client side, and just for the poster.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.