Chapter show pages allocate ~21k+ objects per render for large chapters (18% of app allocations)
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评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 55/100
- Issue 类型
- 重构
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 领域
- backend, performance
调研方向
Start with ChapterController#show and re-measure current 200 responses in the allocations panel or Codebar requests dashboard. Compare the eager-load sets and the shared/sponsors, members/organisers_grid, and shared/newsletter partials, noting that EventCardComponent already fragment-caches. Done means materially lower payload.allocations for 200 responses with subscription forms unchanged for logged-in members.
由索引模型根据 Issue 内容生成。
描述
Issue 2952: Chapter show pages allocate ~21k+ objects per render for large chapters (18% of app allocations)
Summary
ChapterController#show successful renders cost p50 20,880 allocations, p95 70,806 (max 438k) with 15-20 queries per request — 131.7M allocations (18% of app total) over the last 7 days from 4,308 renders. Large-chapter pages (London-style: many upcoming workshops/events) rebuild all public content per view. The 404-probe tail is already handled (#2891/#2907) and is out of scope here: ~1% of allocations.
Measured
7-day window 2026-09-21..27 (canonical logs): 131.7M allocations from 4,308 x 200s; p50 20,880, p95 70,806, max 437,968; 15 queries median, 20 at p95; view p50 11ms. Cost is driven by the controller's eager_load sets (sponsors, organisers, permissions, workshop_host for workshops; venue, sponsors, sponsorships, permissions, organisers for events) plus per-render partials (shared/sponsors, members/organisers_grid, shared/newsletter). Re-measure from current logs or the Codebar requests dashboard (allocations panel) before starting.
The page is public and mostly static. EventCardComponent already fragment-caches itself (used for the event cards); the sponsors and organisers sections do not.
Suggested directions
- HTTP caching for anonymous GETs —
fresh_whenkeyed on[chapter.cache_key_with_version, latest workshop/event cache_key], gated on!logged_in?(the subscriptions partial is per-user). - Fragment-cache the sponsors and organisers sections on the chapter cache key.
- Review the double eager-load sets — up to 20 queries on a cache-cold render suggests some loads are unused by the rendered page.
Verify
payload.allocations p50 for ChapterController#show (200s) drops materially on the allocations panel; no regression for logged-in members (subscription form renders as before).
Related: #2891, #2887, #2888 (same measurement method)
- 主要语言
- Ruby
- 星标
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- 派生
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- 平均合并
- 1 天 2 小时
- 30 天内合并 PR
- 77
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