The 500 OSS Performance Index

Repository snapshot

Performance · 90d

4.9ETV

+61.0% since Q2 2025

ETV / dev / mo

0.5ETV

4 devs · 30-day window

Last 7 days · per dev

1.3ETV

per developer per week

Work mix

Growth19%· 9.3Maintenance75%· 37.6Fixes6%· 2.9

49.8 ETV all-time454 commits12 all-time devsJan 2025 – Jun 2026

Monthly reports

Highlights
Introduced new caching mechanisms in the *Image Pipeline*, including `SimilarImageLookup` [d04a77de · Neha Gupta] and `UnifiedCacheKeyFactory` [55ad40a9 · Neha Gupta], alongside an experimental separate non-bitmap image cache for A/B testing [32a79855 · Alexander Oprisnik].
Enhanced *Image Pipeline* decoding with a quality-aware `BitmapTransformation` API [de4f23c3 · Neha Gupta], a configurable progressive JPEG throttle [a6b73694 · Neha Gupta], and memory optimizations for mutable bitmaps and `ARGB_8888` retry [d6220534 · Oluwatobi Victor Ateniola].
Improved *Fresco Vito* with an "offer-back" integration for the memory cache [8a4f0f62 · Alexander Oprisnik] and accurate image origin tracking for local thumbnails [d0a0db6f · Jillian Lew] and intermediate network results [d5611bc7 · Jillian Lew].
Added a circuit breaker for consecutive frame drop failures in `animated-drawable` [1d3adb69 · Gui Marinho] to improve animation stability and resource management.
Addressed critical issues including a memory leak in *VitoViewImpl2* [09a9b97e · generatedunixname1205258961547606], a race condition in `ExtrasUtils.obtainExtras` [62e7c4d5 · generatedunixname1608173377072046], and a copy-paste bug affecting `forceReloadIfImageAlreadySet` in *Fresco Vito Litho integration* [17885da3 · Alan Lobo].
Observations
The total commit volume decreased by 37% (44 commits this month vs 70-commit 2-month average), suggesting a shift in development pace.
A significant achievement was the 59% reduction in waste score (1 this month vs 2-month average of 2), indicating a strong focus on delivering stable and correct code.
Despite the lower commit volume, the grow score saw a modest 17% decrease (2 this month vs 2-month average of 2), while maintenance remained stable (+5% change), suggesting continued investment in new features and system health.
Multiple maintenance activities involved bulk refactoring via codemods, such as parameter naming standardization [fe6481d0 · Daniel Hill] and redundant visibility modifier removal [7e393ee8 · Daniel Hill], improving code consistency.
Several commits focused on improving null-safety and robustness, including adding `@Nullable` to `CacheKey` [cb9f35de · generatedunixname1333080415543951] and implementing null checks in `AbstractDraweeController` [cb5a7f89 · generatedunixname2004217137144586].
Testing efforts were notable, with new unit tests for `ForwardingControllerListener2` [7775933c · generatedunixname921282244029529] and regression tests for *Vito* lifecycle [5bb18760 · Achille Pette] and `retriggerListeners` field behavior [8e3f2135 · Alan Lobo].
The `animated-base` and `animated-drawable` modules saw refactorings that simplified interfaces like `AnimatedImageFactory` [d291ae30 · generatedunixname970978688699417] and `DrawListener` [f0dc7002 · generatedunixname970978688699417], potentially streamlining future animation development.
Performance4.59 ETV−28%
Commits44 ↗−46%
Performance6.35 ETV+16%
Performance5.46 ETV+29%
Performance4.23 ETV+66%
Performance2.55 ETV−47%

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

31.3 %

Top 3

65.6 %

Top 5

84.1 %

generatedunixname537391475639613 owns 31.3 % of commits.

Top contributors

Most impactful commits

Top 20 by ETV in the all-time window.