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google-labs-jules[bot]andPR0M3TH3AN d3fa684e45 perf: bound relay background concurrency to 3

Replaces unbounded `Promise.all(relays.map(...))` calls with `pMap` using a concurrency limit of 3 for background operations like history hydration, metadata fetching, and DM sending.
This prevents network saturation and potential main-thread jank when many relays are configured.
Includes benchmark verification script `benchmarks/relay_concurrency_repro.mjs`.
Audited upload docs and confirmed accuracy.

Co-authored-by: PR0M3TH3AN <[email protected]>

2026-02-11 21:31:53 +00:00

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Daily Performance Report - 2026-02-08

Summary: Bounded background relay concurrency to 3 to prevent network saturation and UI freezes. Verified upload documentation accuracy.

Findings

P1: Unbounded Relay Concurrency

Location: js/nostr/client.js (fetchAndCacheNip71Metadata, hydrateVideoHistory, _sendNip17DirectMessage).
Impact: Simultaneously opening connections to all relays (could be 20+) caused network congestion and potential UI jank.
Fix: Implemented pMap with RELAY_BACKGROUND_CONCURRENCY = 3.
Status: Fixed.

Metrics

Max Concurrent Relay Requests: Reduced from N (number of relays) to 3.
Login Time: (Not measured directly today, but expected improvement due to reduced initial load).

Docs Audit

Page: content/docs/guides/upload-content.md
Result: Verified accurate. Matches code behavior for file types, size recommendations, and HTTPS enforcement.

Artifacts

[PR #1] perf: bound relay background concurrency
benchmarks/relay_concurrency_repro.mjs created.

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