Benchmarks have been ran with the following versions of modules.

├── async@1.5.2
├── babel@5.8.35
├── davy@1.1.0
├── deferred@0.7.5
├── kew@0.7.0
├── lie@3.0.2
├── neo-async@1.7.3
├── optimist@0.6.1
├── promise@7.1.1
├── q@1.4.1
├── rsvp@3.2.1
├── streamline@2.0.16
├── streamline-runtime@1.0.38
├── text-table@0.2.0
├── vow@0.4.12
└── when@3.7.7

1. DoxBee sequential

This is Gorki Kosev's benchmark used in the article Analysis of generators and other async patterns in node. The benchmark emulates a situation where N=10000 requests are being made concurrently to execute some mixed async/sync action with fast I/O response times.

This is a throughput benchmark.

Every implementation runs in a freshly created isolated process which is warmed up to the benchmark code before timing it. The memory column represents the highest snapshotted RSS memory (as reported by process.memoryUsage().rss) during processing.

Command: ./bench doxbee (needs cloned repository)

The implementations for this benchmark are found in benchmark/doxbee-sequential directory.

results for 10000 parallel executions, 1 ms per I/O op

file                                       time(ms)  memory(MB)
callbacks-baseline.js                           116       33.98
callbacks-suguru03-neo-async-waterfall.js       145       43.81
promises-bluebird-generator.js                  183       42.35
promises-bluebird.js                            214       43.41
promises-cujojs-when.js                         312       64.37
promises-then-promise.js                        396       74.33
promises-tildeio-rsvp.js                        414       84.80
promises-native-async-await.js                  422      104.23
promises-ecmascript6-native.js                  424       92.12
generators-tj-co.js                             444       90.98
promises-lvivski-davy.js                        480      114.46
callbacks-caolan-async-waterfall.js             520      109.01
promises-dfilatov-vow.js                        612      134.38
promises-obvious-kew.js                         725      208.63
promises-calvinmetcalf-lie.js                   730      164.96
streamline-generators.js                        809      154.36
promises-medikoo-deferred.js                    913      178.51
observables-pozadi-kefir.js                     991      194.00
streamline-callbacks.js                        1127      196.54
observables-Reactive-Extensions-RxJS.js        1906      268.41
observables-caolan-highland.js                 6887      662.08
promises-kriskowal-q.js                        8533      435.51
observables-baconjs-bacon.js.js               21282      882.61

Platform info:
Linux 4.4.0-79-generic x64
Node.JS 8.6.0
V8 6.0.287.53
Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz × 4

2. Parallel

This made-up scenario runs 25 shimmed queries in parallel per each request (N=10000) with fast I/O response times.

This is a throughput benchmark.

Every implementation runs in a freshly created isolated process which is warmed up to the benchmark code before timing it. The memory column represents the highest snapshotted RSS memory (as reported by process.memoryUsage().rss) during processing.

Command: ./bench parallel (needs cloned repository)

The implementations for this benchmark are found in benchmark/madeup-parallel directory.

results for 10000 parallel executions, 1 ms per I/O op

file                                      time(ms)  memory(MB)
callbacks-baseline.js                          274       75.11
callbacks-suguru03-neo-async-parallel.js       320       88.84
promises-bluebird.js                           407      107.25
promises-bluebird-generator.js                 432      113.19
callbacks-caolan-async-parallel.js             550      154.27
promises-cujojs-when.js                        648      168.65
promises-ecmascript6-native.js                1145      308.87
promises-lvivski-davy.js                      1153      257.36
promises-native-async-await.js                1260      323.68
promises-then-promise.js                      1372      313.24
promises-tildeio-rsvp.js                      1435      398.73
promises-medikoo-deferred.js                  1626      306.02
promises-calvinmetcalf-lie.js                 1805      351.21
promises-dfilatov-vow.js                      2492      558.25
promises-obvious-kew.js                       3403      784.61
streamline-generators.js                     13068      919.24
streamline-callbacks.js                      25509     1141.57

Platform info:
Linux 4.4.0-79-generic x64
Node.JS 8.6.0
V8 6.0.287.53
Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz × 4

3. Latency benchmarks

For reasonably fast promise implementations latency is going to be fully determined by the scheduler being used and is therefore not interesting to benchmark. JSPerfs that benchmark promises tend to benchmark latency.