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latency-critical-systems

Measure and improve delays in realtime dashboards, data feeds, queues, and caches. Track response times, data age, and waiting work separately, then verify that changes improve the actual behavior of a deployed system.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

원문원문 설명 보기

Optimize and verify latency-sensitive systems — realtime dashboards, market data feeds, streaming agents, execution gateways, queues, and caches — by tracking p50/p95/p99 latency, freshness age, and queue depth, mapping hot paths, and running live readbacks. Use when p95 latency, throughput, or data freshness matters.

affaan-m/ECC
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이럴 때 유용합니다

  • Investigating delays in realtime dashboards
  • Checking whether streamed data is still fresh
  • Reducing queue backlogs
  • Verifying cache behavior in a deployed system

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  • SKILL.md2.4 KB

SKILL.md(원문)

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Latency Critical Systems

Use this skill when the user cares about realtime behavior, hot paths, streaming freshness, or execution speed. This includes HFT-like infrastructure, but the skill is engineering-focused. It does not authorize live trading or financial advice.

Split The Metrics

Do not collapse everything into "fast." Track:

  • p50, p95, and p99 latency;
  • throughput;
  • freshness age;
  • queue depth;
  • cache hit rate;
  • provider/API response time;
  • browser render time;
  • correctness under load;
  • failure and retry behavior.

Map The Hot Path

Write the path from user/event to final visible state:

source event -> provider API -> ingest worker -> queue -> cache -> edge route
-> client stream -> browser render -> user-visible state

Then measure each segment separately.

Optimization Order

  1. Remove unnecessary round trips.
  2. Cache stable reads with freshness metadata.
  3. Batch small calls and writes.
  4. Move compute closer to the data or the user.
  5. Split hot and cold paths.
  6. Apply backpressure before queues grow unbounded.
  7. Use streaming only when it improves freshness or user experience.
  8. Add canaries for stale data, degraded providers, and bad cache state.

Verification

Use live readbacks when a deployed surface exists:

  • HTTP timing and response headers;
  • provider freshness timestamp;
  • queue or job state;
  • edge/cache state;
  • browser verification for actual UI freshness;
  • logs around retries and degraded mode.

For market-data or execution-adjacent paths, also verify orderbook age, VWAP assumptions, provider status, and kill-switch behavior before calling the path ready.

Guardrails

  • Do not optimize latency by dropping required validation.
  • Do not hide stale data behind fast cache hits.
  • Do not claim millisecond behavior from client labels without measurement.
  • Do not run live orders, destructive migrations, or customer-impacting deploys without an explicit approval gate.
  • Keep secrets and private payloads out of logs and benchmark artifacts.

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