# colin-scott/interactive_latencies

Jeff Dean's latency numbers plotted over time

Repository: https://github.com/colin-scott/interactive_latencies
Canonical: https://ross.abutalabs.com/products/interactive_latencies
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2024-08-11T21:57:14+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5000, "days_push": 752, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2171, forks 467 (observed 2026-08-28T04:06:21.768750+00:00)

## What it is
An interactive visualization of Jeff Dean's famous latency numbers every programmer should know, plotted over time. It also offers a terminal version accessible via cheat.sh/latencies.

## Use cases
- look up typical latency numbers for disk, network, and memory operations
- teach systems performance concepts with a visual timeline
- check how SSD vs HDD vs RAM latencies have changed over the years
- quickly fetch latency figures from the terminal during system design interviews
- reference latency magnitudes when estimating system design tradeoffs

## When to choose
- you need a quick, visual reference for latency magnitudes in system design
- you want an up-to-date version of Jeff Dean's latency numbers
- you prefer a terminal-friendly cheat sheet via curl

## When to avoid
- you need precise, benchmarked latency figures for your specific hardware
- you need a tool rather than a reference chart

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: data-visualization, developer-tools
- domain: developer-tools, education, performance
- platform: cli
- tags: latency-numbers, jeff-dean, cheat-sheet, interactive-chart, systems-programming, algorithms, web

## Member repositories
- colin-scott/interactive_latencies (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:21.768750+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:49:14.856187+00:00, confidence not recorded.
  - readme: https://github.com/colin-scott/interactive_latencies (fetched 2026-08-28T04:06:21.768750+00:00, sha dc6ebf03672f)
- Data as of 2026-08-30T08:39:29.467469+00:00.