perf: Core Web Vitals, CDN caching, indexer & compression (#706 #707 #708 #709)#756
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Hexstar-labs merged 2 commits intoJun 29, 2026
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…rainTease#709 BrainTease#706 Core Web Vitals Optimisation - Fix CLS on courses page (stable min-height container for grid) - Fix CLS on profile page (skeleton loader, explicit avatar dimensions) - Add preconnect hints for API origin and avatar CDNs in layout - Harden lighthouserc.js CWV assertions from warn to error level - Add .github/workflows/lighthouse.yml CI gate BrainTease#707 HTTP Caching & CDN Strategy - Add CacheHeadersMiddleware (Cache-Control + ETag + 304 support) - Wire middleware globally in AppModule - Add docs/CDN_SETUP.md with full CDN strategy and hit-ratio guide BrainTease#708 Indexer & Event Query Performance - Rewrite stellar-indexer: batched processing (Promise.allSettled) - Add back-pressure (skip busy tick, exponential back-off) - Write lag metrics to cache after every poll - Cold-start fast-path (jump to latest ledger unless INDEXER_CATCHUP=true) BrainTease#709 API Response Compression & Payload Slimming - Add compression package, enable gzip/brotli in main.ts - Add SparseFieldsInterceptor for ?fields= sparse responses - Document payload reduction in README
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Summary
Implements four performance issues in a single PR.
#706 — Core Web Vitals Optimisation
CourseGridin amin-h-[480px]container; fixed SVG icon with explicitwidth/height.<link rel="preconnect">for the API origin and avatar CDNs in the root layout.lighthouserc.jsfromwarn→error; added.github/workflows/lighthouse.yml.#707 — HTTP Caching & CDN Strategy
CacheHeadersMiddleware—Cache-Control(public+SWR for safe GETs, private for auth'd, no-store for mutations),ETag(SHA-1),304on matchingIf-None-Match.AppModule.docs/CDN_SETUP.md— header matrix, CloudFront/Cloudflare config, invalidation strategy, hit-ratio measurement.#708 — Indexer & Event Query Performance
Promise.allSettledin chunks of 10 — one bad event never blocks the rest.indexer:lag_ledgers+indexer:last_poll_mswritten to Redis after every poll.INDEXER_CATCHUP=truefor full historical replay).#709 — API Response Compression & Payload Slimming
compression@1.7.4added;app.use(compression({ threshold: 1024 }))inmain.ts(gzip/brotli, ≥ 1 KB).SparseFieldsInterceptor— global interceptor, trims responses to?fields=id,title,level,price.Files changed
.github/workflows/lighthouse.yml(new)apps/backend/package.jsonapps/backend/src/app.module.tsapps/backend/src/main.tsapps/backend/src/common/middleware/cache-headers.middleware.ts(new)apps/backend/src/common/interceptors/sparse-fields.interceptor.ts(new)apps/backend/src/stellar/stellar-indexer.service.tsapps/frontend/lighthouserc.jsapps/frontend/src/app/courses/page.tsxapps/frontend/src/app/layout.tsxapps/frontend/src/app/profile/page.tsxdocs/CDN_SETUP.md(new)README.mdcloses #706
closes #707
closes #708
closes #709