Check the history of the source code.
Looks like it is related to this commit:
https://github.com/joyent/node/commit/fc6f8a69438d45640d4d0a76633b57965c1f843a
Long story short: delete is costly because it disrupts the layout of the
internal [[Class]].
Setting to undefined if faster, but unused keys pile up eating memory.
On Tuesday, October 15, 2013 1:44:11 PM UTC+2, Gagle wrote:
>
> Why? Any major changes? Have you introduced additional nextTick or
> setImmediate calls?
>
> *CODE*
>
> "use strict";
>
> var events = require ("events");
> var util = require ("util");
> var speedy = require ("../lib");
>
> var Emitter = function (){
> events.EventEmitter.call (this);
> };
>
> util.inherits (Emitter, events.EventEmitter);
>
> Emitter.prototype.ping = function (){
> this.emit ("ping");
> };
>
> var emitter = new Emitter ();
>
> speedy.run ({
> emitter: function (done){
> emitter.once ("ping", done);
> emitter.ping ();
> }
> });
>
> *RESULT v0.10.13 (node.exe binary on windows 7 x64)*
>
> File: emitter-vs-callback.js
>
> Node v0.10.13
> V8 v3.14.5.9
> Speedy v0.1.0
>
> Benchmarks: 2
> Timeout: 1000ms (1s 0ms)
> Samples: 3
> Total time per benchmark: ~3000ms (3s 0ms)
> Total time: ~6000ms (6s 0ms)
>
> Higher is better (ops/sec)
>
> emitter
> *2,062,441 ± 0.5%*
>
> Elapsed time: 6054ms (6s 54ms)
>
> *RESULT v0.10.20 (node.msi installer on windows x64)*
>
> File: emitter-vs-callback.js
>
> Node v0.10.20
> V8 v3.14.5.9
> Speedy v0.1.0
>
> Tests: 2
> Timeout: 1000ms (1s 0ms)
> Samples: 3
> Total time per test: ~3000ms (3s 0ms)
> Total time: ~6000ms (6s 0ms)
>
> Higher is better (ops/sec)
>
> emitter
> *684,655 ± 0.4%*
>
> Elapsed time: 6053ms (6s 53ms)
>
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