On 17.04.2007, at 19:21, mdelmarter wrote:
Hi all,
I have been using Ext and jQuery for a few weeks now. One issue with
this combination is the sheer volume of JavaScript and CSS that needs
to be used. Because I am working with a large application I have been
experiementing with different techniques to improve performance,
minimizing the download of JS and CSS. To read about my experiences
and a new technique I am using you can view explanations and examples
on my blog:
http://matthew.delmarters.com/weblog/injecting-javascript-and-css-
into-iframes/
Hi
Not meant as an offense, but you asked for feedback :-)
I've read the blog entry but I'm entirely unsure about the real
benefit of it. My experiences so far with using scripts across
frames, especially dynamically written iframes, is really bad. It
will usually work for 95% of your users but I experienced bad timing
issues with 5% of the rest. It's really a pain to debug those, if you
care to have serve your page to those 5%.
It might be that your solution does not have those problems - I have
not tested it (and actually, my computer is not as broken as those of
those 5% of our customers, so I could not even test it), but I'm
always wary of all kinds of iframe hacks and use them only if I
absolutely must.
Also, the main benefit you're advertising seems to be decreased
download times, but a proper webserver setup (especially the use of
the Expires HTTP header) and combining all stylesheets and scripts at
the server side will already give you most of the speed boost anyway
- maybe an even higher speed boost if proxies are involed and your
main HTML page is not properly cacheable - and there's no caching
issue either with "versioned URLs" (e.g. putting a timestamp in the
script and CSS URLs)
If I've not overlooked something, you basically eliminated the TCP
overhead for the two additional connections (if Keep-Alive is not
used on the server....) but I'm not sure the price is not too high
for that.
It's a nice hack, but I'm unsure whether I would want to use such a
hack.
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