SpeedPlayer is a local-first practice player built for review, repetition, and focused learning. It is not trying to be a giant media hub or a video editor. It is built to do one thing well: load your own media, slow it down, loop the exact part you need, remember your context, and help you continue practicing later. Great for: ① dance practice ② sports movement review ③ instrument phrase repetition ④ shadowing, dictation, and speaking practice