Reactive Scrabble Benchmarks

❓ Why haven't I measured library X ???

:left_arrow: I can't know or remember all data processing libraries of the Java ecosystem! PR welcome.

Run a specific benchmark

gradlew jmh -PjmhIncludes=Helidon --rerun-tasks

Results (alphabetic)

Specs: i9 275HX (8P+16E, 2.7GHz+), 32GB LPDDR5 6400MT CL52, Windows 25H2, JDK 26.0.1

Timestamp: 2026.07.22 16:00

Benchmark	Version	Score	Error	Units
AbacusCommon	7.8.8	24,711	± 0,270	ms/op
AkkaStream	2.13	249,370	± 13,106	ms/op
AnnimonStream	1.2.2	9,104	± 0,057	ms/op
CyclopsReact	2.1.1	21,071	± 0,455	ms/op
EclipseCollections	13.0.0	6,465	± 0,027	ms/op
Guava	33.6.0s	14,104	± 0,172	ms/op
Helidon	4.5.1	15,909	± 0,172	ms/op
IEnumerable4Java	1.0.0	8,928	± 0,087	ms/op
IObservable4Java	1.0.0	8,593	± 0,094	ms/op
Iterable4Java	0.98.1	15,665	± 0,191	ms/op
IxJava	1.0.0	9,221	± 0,072	ms/op
JOOL	0.9.15	41,213	± 0,713	ms/op
JoxFlows	0.5.3	33,247	± 0,247	ms/op
JavaForLoop	26.0.1	2,523	± 0,015	ms/op
JavaStream	26.0.1	10,608	± 0,129	ms/op
JavaStreamParallel	26.0.1	1,321	± 0,006	ms/op
Mutiny	3.3.0	27,250	± 0,161	ms/op
PekkoStream	2.0.0M3	224,951	± 5,113	ms/op
Reactive4Java	0.98.1	355,223	± 11,164	ms/op
Reactor	3.8.6	15,604	± 0,160	ms/op
ReactorParallel	3.8.6	3,697	± 0,147	ms/op
RxJava1	1.3.8	50,612	± 0,421	ms/op
RxJava2Flowable	2.2.21	13,057	± 0,146	ms/op
RxJava2Observable	2.2.21	11,494	± 0,120	ms/op
RxJava2Parallel	2.2.21	3,089	± 0,135	ms/op
RxJava3Flowable	3.1.12	13,288	± 0,173	ms/op
RxJava3Observable	3.1.12	11,707	± 0,121	ms/op
RxJava3Parallel	3.1.12	3,085	± 0,123	ms/op
RxJava4Flowable	4.0.0a21	12,646	± 0,138	ms/op
RxJava4Observable	4.0.0a21	11,818	± 0,134	ms/op
RxJava4Streamable	4.0.0a21	19,190	± 0,187	ms/op
StreamExAmaembo	0.9.0	12,444	± 0,192	ms/op
Vavr	1.0.1	48,369	± 0,631	ms/op

by time, lower is better

Benchmark	Version	Score	Error	Units
JavaStreamParallel	26.0.1	1,321	± 0,006	ms/op
JavaForLoop	26.0.1	2,523	± 0,015	ms/op
RxJava3Parallel	3.1.12	3,085	± 0,123	ms/op
RxJava2Parallel	2.2.21	3,089	± 0,135	ms/op
ReactorParallel	3.8.6	3,697	± 0,147	ms/op
EclipseCollections	13.0.0	6,465	± 0,027	ms/op
IObservable4Java	1.0.0	8,593	± 0,094	ms/op
IEnumerable4Java	1.0.0	8,928	± 0,087	ms/op
AnnimonStream	1.2.2	9,104	± 0,057	ms/op
IxJava	1.0.0	9,221	± 0,072	ms/op
JavaStream	26.0.1	10,608	± 0,129	ms/op
RxJava2Observable	2.2.21	11,494	± 0,120	ms/op
RxJava3Observable	3.1.12	11,707	± 0,121	ms/op
RxJava4Observable	4.0.0a21	11,818	± 0,134	ms/op
StreamExAmaembo	0.9.0	12,444	± 0,192	ms/op
RxJava4Flowable	4.0.0a21	12,646	± 0,138	ms/op
RxJava2Flowable	2.2.21	13,057	± 0,146	ms/op
RxJava3Flowable	3.1.12	13,288	± 0,173	ms/op
Guava	33.6.0s	14,104	± 0,172	ms/op
Reactor	3.8.6	15,604	± 0,160	ms/op
Iterable4Java	0.98.1	15,665	± 0,191	ms/op
Helidon	4.5.1	15,909	± 0,172	ms/op
RxJava4Streamable	4.0.0a21	19,190	± 0,187	ms/op
CyclopsReact	2.1.1	21,071	± 0,455	ms/op
AbacusCommon	7.8.8	24,711	± 0,270	ms/op
Mutiny	3.3.0	27,250	± 0,161	ms/op
JoxFlows	0.5.3	33,247	± 0,247	ms/op
JOOL	0.9.15	41,213	± 0,713	ms/op
Vavr	1.0.1	48,369	± 0,631	ms/op
RxJava1	1.3.8	50,612	± 0,421	ms/op
PekkoStream	2.0.0M3	224,951	± 5,113	ms/op
AkkaStream	2.13	249,370	± 13,106	ms/op
Reactive4Java	0.98.1	355,223	± 11,164	ms/op