Hi @Vincenzo
Thanks for your post. We appreciate your interest in segment leaderboards - they’re an important part of Strava.
We have a couple of ongoing initiatives around this. As part of our effort to declutter segments,we’re combing through our segment database, deleting any duplicate and unused Segments with bad GPS data. We also recently launched an upgraded auto-flagging system designed to catch over a third more “impossible” segment times before they even show up on leaderboards. Read more at the links below and thanks again.