microsoft/mimalloc
What happens to a stranger's pull request here, in the Porchlamp snapshot of 17 October 2026.
Outside pull requests to microsoft/mimalloc got a first human reply in a median of 4.7 days (50 pull requests, 18 April to 15 October 2026); 31% got none within 14 days. It ranks 2,861 of 3,219 overall. It is not ranked for first-time contributors: this repository does not show a low enough barrier for a first-time contributor.
| Rank | 2,861 of 3,219 |
|---|---|
| Score | 37.02 |
| Tier | D |
| Median first reply | 4.7 days (112.5 hours) |
| 14-day no-reply share | 31% |
| First-timer rank | This repository does not show a low enough barrier for a first-time contributor. |
| Ecosystem | C and C++ |
| Window | 18 April to 15 October 2026 |
Composite
- Rank
- 2,861 of 3,219
- Score
- 37.02
- Tier
- D
- Coverage
- 96% · Full
- Quadrant
- Graveyard
Coordinates: leverage 44.6 (coverage 100%), friction 68.2 (coverage 94%)
Five pillars
| Pillar | Score | Coverage |
|---|---|---|
| Responsiveness | 43.4 | 100% |
| Criticality | 53.3 | 100% |
| Governance | 29.5 | 100% |
| Rigor | 40.1 | 100% |
| Accessibility | 6.3 | 70% |
The measured parameters
Responsiveness
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Decision Rate (90d)Share of outside pull requests that were merged or closed within 90 days. | 92.6% | 100.0 | 27 | 18 April to 17 July 2026 | primaryraw/pr_window/microsoft__mimalloc.json |
| PR Ghost Rate (14d)Share of outside pull requests with no maintainer response, merge or close within 14 days. | 31.0% | 37.9 | 58 | 20 April to 17 October 2026 | primaryraw/pr_window/microsoft__mimalloc.json |
| First-timer Merge RateShare of first-time outside authors' decided pull requests that were merged. | 20.0% | 25.0 | 40 | — | primaryraw/author_history/microsoft__mimalloc.json |
| Time to First ResponseMedian hours from an outside pull request opening to its first substantive human reply. | 112.5 hours (4.7 days) | 19.3 | 50 | 18 April to 15 October 2026 | primaryraw/pr_window/microsoft__mimalloc.json |
| Time to Merge (p90)Hours within which 90% of merged outside pull requests were merged. | 927.8 hours (38.7 days) | 19.0 | 29 | 18 April to 15 October 2026 | primaryraw/pr_window/microsoft__mimalloc.json |
Criticality
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| DependentsPackages in the registry that depend on this project, counted once each. | Not shown: Not applicable | ||||
| Monthly DownloadsDownloads from the package registry in a month. | Not shown: Not applicable | ||||
| OpenSSF CriticalityOpenSSF criticality score from 0 to 1, computed from the project's public activity signals. | 0.5329 | 53.3 | — | — | proxy:no_dependents_signalraw/github_meta/microsoft__mimalloc.json |
Governance
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Elephant FactorThe fewest organisations that account for half of the last year's commits. | 1 | 25.0 | 997 | — | primaryraw/commits_365d/microsoft__mimalloc.json |
| Legal IP RegimeThe contributor licence regime: DCO, none, a foundation CLA or a corporate CLA. | Company CLA | 25.0 | — | — | primaryraw/governance/microsoft__mimalloc.json |
| Promotion LadderHow openly a contributor can become a maintainer, from closed to verified. | No written path to becoming a maintainer | 40.0 | — | — | primaryraw/governance/microsoft__mimalloc.json |
Rigor
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| AI Policy PostureWhether the project has a written policy on AI-assisted contributions. | No written AI policy | 40.0 | — | — | primaryraw/governance/microsoft__mimalloc.json |
| Pipeline DefensesHow well the project's build and review pipeline defends against bad changes, 0 to 100. | 65 | 65.0 | — | — | primaryraw/scorecard/microsoft__mimalloc.json |
| Substantive Review RateShare of decided pull requests that received a substantive review. | 5.6% | 7.0 | 71 | 18 April to 15 October 2026 | primaryraw/pr_window/microsoft__mimalloc.json |
Accessibility
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Developer ExperienceDeveloper experience, 0 to 100: half CI run time, half setup signals. | Not shown: Insufficient sample size | ||||
| Newcomer ConversionShare of first-time authors whose first pull request merged within 180 days. | 6.3% | 12.5 | 16 | — | primaryraw/author_history/microsoft__mimalloc.json |
| Newcomer Issue SupplyOpen, unassigned, up-to-date issues marked for newcomers. | 0 | 0.0 | — | — | primaryraw/gfi/microsoft__mimalloc.json |
| Newcomer Return RateShare of those merged first-time authors who sent a second pull request within 90 days. | Not shown: Insufficient sample size | ||||
Persona view
| Persona | Rank | Score | Tier | Status |
|---|---|---|---|---|
| Balanced | 2,861 of 3,219 | 37.02 | D | Rated |
| First-timer | This repository does not show a low enough barrier for a first-time contributor. | |||
| Career capital | This repository's production-criticality signal is not yet high enough for career-capital ranking. | |||
| Senior systems | Fewer than 3 organizations account for most commits (not multi-vendor). | |||
| AI-assisted | 3,221 of 3,696 | 38.42 | D | Rated |
Integrity
- Snapshot
- 2026-10-17
- Raw hash
- 1b5119b123bc3512242cdae75759d02f6d518b20a8a0c75ad309365e39a7142b
No suspicion flags on this repository.
The full record is in data/2026-10-17/repos/98.json, under the key microsoft/mimalloc.
How every number is measured: Porchlamp methodology.
Open an issue about this record and say what looks wrong.
Porchlamp (2026). microsoft/mimalloc. Snapshot 2026-10-17. https://porchlamp.org/projects/microsoft/mimalloc/. CC BY 4.0.
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