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Parallel loading of scripts

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Jan van Gent

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Feb 24, 2010, 5:58:22 AM2/24/10
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Will 10.5 offer parallel loading of scripts?
http://www.stevesouders.com/blog/2010/02/07/browser-script-loading-roundup/

Jan


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Jan van Gent

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Feb 24, 2010, 6:02:47 AM2/24/10
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On Wed, 24 Feb 2010 11:58:22 +0100, Jan van Gent <janvan{away}ge...@zonnet.nl> wrote:

> Will 10.5 offer parallel loading of scripts?
> http://www.stevesouders.com/blog/2010/02/07/browser-script-loading-roundup/
>
> Jan
>
>

Hmm, discovered a setting in config that does just that.
opera:config#Extensions|DelayedScriptExecution

Eik

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Feb 24, 2010, 6:21:27 AM2/24/10
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On Wed, 24 Feb 2010 11:02:47 -0000, Jan van Gent
<janvan{away}ge...@zonnet.nl> wrote:

>> Will 10.5 offer parallel loading of scripts?

> Hmm, discovered a setting in config that does just that.
> opera:config#Extensions|DelayedScriptExecution

So it already does before 10.5 then :-)

It's probably disabled by default because it has unwanted side effects on
some badly made websites.

Jan van Gent

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Feb 24, 2010, 9:58:26 AM2/24/10
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On Wed, 24 Feb 2010 12:21:27 +0100, Eik <sp...@hotmail.com> wrote:

> On Wed, 24 Feb 2010 11:02:47 -0000, Jan van Gent
> <janvan{away}ge...@zonnet.nl> wrote:
>
>>> Will 10.5 offer parallel loading of scripts?
>
>> Hmm, discovered a setting in config that does just that.
>> opera:config#Extensions|DelayedScriptExecution
>
> So it already does before 10.5 then :-)

Yes.

> It's probably disabled by default because it has unwanted side effects on
> some badly made websites.
>

Any real world examples?
It's interesting because Firefox 3.6, Chrome, Safari and even MSIE 8 do enable it by default.

Eik

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Feb 24, 2010, 1:48:50 PM2/24/10
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On Wed, 24 Feb 2010 14:58:26 -0000, Jan van Gent
<janvan{away}ge...@zonnet.nl> wrote:

>> It's probably disabled by default because it has unwanted side effects
>> on
>> some badly made websites.
>>
>
> Any real world examples?

None, I'm just guessing based on the fact it's had it for a while yet they
choose to disable it by default and leave the setting somewhere only a
techie is likely to find it. It's a bit like the database option for the
mail client storage - I assume they're not confident enough that having
all your mail in one database file won't result in a single accident
wiping it all.

> It's interesting because Firefox 3.6, Chrome, Safari and even MSIE 8 do
> enable it by default.

Well I'm glad they do. I remember asking about this a few years ago and
the answer was that IE was the only browser that did anything with the
'defer' attribute on <script> tags. I used to add it to all my pages
anyway on the assumption that at worst it wouldn't cause any harm in
current browsers and at best browsers would one day add support.

If all the other important browsers have it enabled by default, maybe
Opera should change, though I think the days when this feature would have
been at its most useful was when we all had slow CPUs and little RAM!

Jan van Gent

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Feb 25, 2010, 5:08:53 AM2/25/10
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IMHO, now with fast internet (14Mb) and max connections 64 / 20 per site (here Opera's default settings are to low in my experience) loading numerous scripts is the main factor to slow down the rendering of a website.

Enabling makes my Opera loading and rendering sites 30-40% faster.

Try this example:
http://stevesouders.com/cuzillion/?ex=10008&title=Scripts+Block+Downloads&t=1267091992

Normal
page load time: 10977 ms

Delayed execution:
page load time: 6419 ms

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