The 500 OSS Performance Index

Repository snapshot

Performance · 90d

113.4ETV

+52.0% since Q2 2025

ETV / dev / mo

3.3ETV

6 devs · 30-day window

Last 7 days · per dev

0.7ETV

per developer per week

Work mix

Growth29%· 104.9Maintenance54%· 196.2Fixes18%· 65.2

366.3 ETV all-time2,522 commits15 all-time devsJan 2025 – Jun 2026

Monthly reports

Highlights
Introduced experimental support for *WebKit WebViews* automation, including new core functionalities for RDP connections and interactions [25f22d21 · Pavel Feldman].
Enhanced *WebView* capabilities with keyboard and mouse input synthesis [9fe284a5 · Yury Semikhatsky] and improved site isolation support for *WebKit webviews* [c27ccc43 · Yury Semikhatsky].
Expanded *device emulation profiles* to include Galaxy Z Fold/Flip, iPhone 16, and iPhone 17 families [872105a8 · Dmitry Munda], [4cd7f685 · Dmitry Munda].
Added keyboard navigation to the *HTML Reporter*'s `TabbedPane` component, improving accessibility [3edc77fc · Padmaraj Nidagundi].
Implemented a new `--output-max-size` option for the *MCP backend* to manage disk usage with post-response eviction [525f3754 · Simon Knott].
Rolled *WebKit* and *Firefox Beta* to newer revisions, ensuring compatibility with the latest browser versions [fda3cd3c · microsoft-playwright-automation[bot]], [79b8f72e · microsoft-playwright-automation[bot]], [54d0f8c4 · microsoft-playwright-automation[bot]].
Introduced support for *Ubuntu 26.04*, broadening Playwright's compatibility [f98da235 · Yury Semikhatsky].
Added `printFailuresInline` option to the *list reporter* for immediate feedback during test runs [4d289016 · Pavel Feldman].
Implemented *ARIA snapshotting* support for the `aria-invalid` attribute, enhancing accessibility testing [2d04b344 · Aditya Singh].
Observations
Overall output decreased by 41% and grow score by 36% compared to the 2-month average, indicating a slowdown in new feature development.
Maintenance score saw a significant 68% decrease compared to the 2-month average, suggesting less effort was spent on refactoring or technical debt.
Waste score increased by 60% (current: 11, 2-month average: 7), primarily driven by bug fixes across various components, including *MCP*, *WebView*, *server-side cookie management*, and *CI/CD reporting*.
The *Multi-Context Playwright (MCP)* component was a hotspot for fixes, with multiple commits addressing issues like invalid tool arguments [67241ff9 · Huibin Wang], writable cache directories [2fc9d1c3 · Aditya Singh], browser disconnection on dispose [bd4d83f6 · Simon Knott], and dashboard server teardown [142582cb · Simon Knott].
Significant effort was directed towards refining and extending the `connectOverCDP` API, involving refactoring [4afdd64a · Pavel Feldman], adding custom transport support for *WebKit* [f14741d7 · Pavel Feldman] and *Chromium* [8f503225 · Yury Semikhatsky], and implementing remote connection validation [74fc94e6 · Simon Knott].
Continuous browser engine updates were observed, with multiple rolls for *WebKit* and *Firefox Beta* throughout the month [fda3cd3c · microsoft-playwright-automation[bot]], [bb8d775b · microsoft-playwright-automation[bot]], [79b8f72e · microsoft-playwright-automation[bot]], [1081edab · microsoft-playwright-automation[bot]], [e32f9073 · microsoft-playwright-automation[bot]], [54d0f8c4 · microsoft-playwright-automation[bot]].
Several commits addressed specific bug fixes related to *WebView* functionality, such as cross-origin process swaps [08a37f29 · Yury Semikhatsky] and site isolation [c27ccc43 · Yury Semikhatsky], indicating complexity in this area.
Improvements to developer experience were made through better error reporting for unsupported Node.js versions [ee5a51e7 · Simon Knott] and enhanced CI/CD workflows [624ef28d · Yury Semikhatsky], [de3aa6a7 · Dmitry Gozman].
Performance30.41 ETV−53%
Commits260 ↗−17%
Performance64.45 ETV+70%
Performance37.89 ETV+56%
Performance24.30 ETV−9.4%
Performance26.81 ETV+70%

Performance over time

ETV stacked by Growth, Maintenance and Fixes — 90-day moving average, normalized to ETV / month.

Average performance per developer

ETV per active developer per month — 30-day moving average.

Active developers over time

Unique developers committing each day — 90-day moving average.

Knowledge concentration

How dependent is this repo on a small number of contributors? Higher top-1 share = higher key-person risk.

Top 1

25.9 %

Top 3

66.3 %

Top 5

87.3 %

Pavel Feldman owns 25.9 % of commits.

Top contributors

Most impactful commits

Top 20 by ETV in the all-time window.