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---
name: landing-performance
description: Fix performance issues in apps/landing for leaderboards, battles, rankings, vote/reaction summaries, and high-cardinality result pages.
---
# Landing Performance
## Rules
- Leaderboards must page or window results.
- Ranking queries must avoid full-table client sorting.
- Battle lists should render summary cards only on first load.
- Expensive aggregates must be checked for index support and payload size.
- Do not request full battle history when only top slices are visible.
## Gotchas
- Rank pages often fail because the UI requests more rows “just in case”.
- Score, XP, reactions, and joins can multiply row cost quickly.
