CF Performance Mirror is a lightweight Chrome extension that shows contest-wise average & median solve times (per index A, B, C…) and high WA% topics directly on Codeforces profile pages. Compact, non-intrusive, and reads only public CF APIs. Install → open any profile → get contest timing + friction insights.
Why I built this
When preparing for contests I kept asking: Which problem types slow me down? How long do I actually take on an A/B/C? CF Performance Mirror surfaces those answers right on the profile, so you can focus training where it helps most.
Key features (quick)
- Per-index timing: average & median solve time (minutes) per problem index (A, B, C…).
- High WA% topics: topics ranked by wrong-attempt percentage (contest / overall).
- Modes: Total / Rated / Unrated contests — view timings separately.
- Compact UI: anchored under the profile area (like other CF widgets), non-blocking.
- Privacy first: client-side script only reads public CF APIs (user.status, contest.list, user.rating). No personal 6. data collected or sent to servers.
UI preview of CF Performance Mirror on a user profile
Shows contest-wise timings and WA% analysis
