jlfwong/speedscope
🔬 A fast, interactive web-based viewer for performance profiles. observed · 2026-08-28
Health v2 · maintenance only
73/100
- Activity 82
- Release rhythm 47
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 35
- age_days: 3206
- days_rel: 273
- days_push: 110
- n_releases_24m: 10
Adoption not part of the score
6730 stars · 320 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
speedscope is a fast, interactive web-based viewer for performance profiles that imports data from many profilers across languages like JavaScript, Python, Ruby, Go, and Java. It lets developers interactively explore flamegraphs and other views to find what is slow or memory-hungry in their applications.
Use cases
- visualize a flamegraph from a Chrome or Node.js CPU profile
- analyze py-spy or pyinstrument profiles from a Python app
- view pprof profiles from a Go service
- explore async-profiler or Java Flight Recorder output
- find performance bottlenecks in a Ruby app with rbspy profiles
- inspect perf or Instruments.app profiles for native code
When to choose
- you need a free, interactive flamegraph viewer that runs in the browser
- you have profiling data from multiple languages and want one tool to view them all
- you want to share profile analysis without installing heavy desktop tooling
When to avoid
- you need continuous production profiling or alerting rather than offline profile viewing
- you need a profiler itself - speedscope only visualizes existing profile data
- you require deep IDE-integrated profiling workflows
Facets
application · maturity stable
data-visualization benchmarking developer-tools developer-tools performance data-visualization browser cli cross-platform flamegraph profiling performance-profiling typescript webgl web-server nodejs
3 sources
- readme: https://github.com/jlfwong/speedscope · fetched 2026-08-28 · 0897eb038b00
- homepage: https://www.speedscope.app · fetched 2026-08-29 · e7662bb1ad03
- registry_npm: https://registry.npmjs.org/speedscope · fetched 2026-08-29 · fc456ea65def
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| jlfwong/speedscope | main | 73 |
For agents
markdown · JSON · MCP: product_card(name="jlfwong/speedscope")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem