[Webkit-unassigned] [Bug 172439] Figure out why Firefox's score goes up by 40% on Speedometer 2 compared to 1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172439

Jan de Mooij <jdemooij at mozilla.com> changed:

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                 CC|                            |jdemooij at mozilla.com

--- Comment #12 from Jan de Mooij <jdemooij at mozilla.com> ---
(In reply to Ryosuke Niwa from comment #11)
> For example, Ember JS's runtime went up from 535ms to 1236ms in Safari

One thing I noticed while profiling EmberJS in Firefox is that we spend quite a lot of time in debug code, stuff like this in addObserverForContentKey:

  _emberMetalDebug.assert('When using @each to observe the array ' + content + ', the array must return an object', typeof item === 'object');

Here they concatenate an array of objects to a string, so we end up with a string containing "[object Object],[object Object],[object Object]...".

We can all optimize this in our engines, but it seems pretty silly to have this kind of code in these benchmarks/frameworks. Similar issues have been fixed upstream (in Ember) as it came up in other Ember benchmarks too.

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