If your site may be viewed by mobile devices such as
the iPhone, it is very important to minify your CSS
and JS files in addition to gzip.

iPhone decompress (unzip) CSS/JS before storing it to
cache. There is a size limit of 25K bytes and decoded
files over that limit are not cached.

Regards,
- Wayne

--- "Frank A." <fsa3@...> wrote:

> Is it really necessary to Minify your CSS and JS
> code if it will also be
> gzipped?  Doesn't gzip get rid of wasted space?
>
>
>
>
>
>



      
________________________________________________________________________________\
____
Special deal for Yahoo! users & friends - No Cost. Get a month of Blockbuster
Total Access now
http://tc.deals.yahoo.com/tc/blockbuster/text3.com

If you provided a url, other people can tell you whether they're YSlow
installations say it's
GZipped.  I mean, you're saying that YUI files are not GZipped, so your system
is already
behaving differently than mine.

(on a sidenote, if you're actually using ethereal, it is recommended you move
over to
wireshark.  I just say that because many people don't seem to know that
development has
moved and that ethereal's last security advisory recommends you to upgrade to
wireshark.)

-David

--- In exceptional-performance@yahoogroups.com, "Frank" <fsa3@...> wrote:
>
> Hi,
> I'm wondering if there are known issues with YSlow determining what is
> GZipped.  For my site it shows that the html content is not GZipped
> yet when I watched the content go over the network (using ethereal) I
> see it is GZipped.
>
> Also it tells me that all the YUI files that are being served up by
> Yahoo are not GZipped (I haven't verified this with Ethereal).
>
> Thanks.
>

Does anyone know of a service which allows you to check your web site's
connectivity/latency from multiple locations? We have our site hosted in a
single datacenter on the east coast and are considering using a CDN but need
to know how much of a speed up we're likely to get if we move the content
closer to our end users (the majority of which are US based).

Thanks
Nick

A number of people have recommended Gomez and Keynote. I have not used
either directly, but one of the CDN's we were trailing sent us their
Gomez printouts which naturally presented their CDN in a shining light.

Cheers

Dave

I've found that both Gomez and Keynote seem to be on a much faster
internet connection than the rest of reality, so always take them with
a pinch of salt.

Good for making a CDN or site implementation seem fast, or if you want
an external service to alert you when your site is down... otherwise,
especially in driving tech teams to actually create optimized
implementations, then they tend to be a bit useless.



Chris



On Mon, Mar 31, 2008 at 6:57 PM, Dave Cheney <dave@...> wrote:
>
>
>
>
>
>
> A number of people have recommended Gomez and Keynote. I have not used
>  either directly, but one of the CDN's we were trailing sent us their
>  Gomez printouts which naturally presented their CDN in a shining light.
>
>  Cheers
>
>  Dave
>
>

-Pat

From: exceptional-performance@yahoogroups.com [mailto:exceptional-performance@yahoogroups.com] On Behalf Of Dave Cheney
Sent: Monday, March 31, 2008 6:57 PM
To: exceptional-performance@yahoogroups.com
Subject: Re: [exceptional-performance] Latency measurements

A number of people have recommended Gomez and Keynote. I have not used
either directly, but one of the CDN's we were trailing sent us their
Gomez printouts which naturally presented their CDN in a shining light.

Cheers

Dave

This is the core business model for Keynote and Gomez.  Many CDNs will
arrange for a temp account with one of these to validate the benefit
they'll bring you during the sales cycle.  (Hint:  tell them to.)

Ernest
______________________
UN-altered REPRODUCTION and DISSEMINATION of
this IMPORTANT information is ENCOURAGED.




              "Nick Le Mouton"
              <noodles@planetsl
              ackers.com>                                                To
              Sent by:                  <exceptional-performance@yahoogroup
              exceptional-perfo         s.com>
              rmance@yahoogroup                                          cc
              s.com
                                                                    Subject
                                        [exceptional-performance] Latency
              03/31/2008 05:37          measurements
              PM


              Please respond to
              exceptional-perfo
              rmance@yahoogroup
                    s.com






Does anyone know of a service which allows you to check your web site's
connectivity/latency from multiple locations? We have our site hosted in a
single datacenter on the east coast and are considering using a CDN but
need
to know how much of a speed up we're likely to get if we move the content
closer to our end users (the majority of which are US based).

Thanks
Nick

Any chance we can get a version of Yslow that works with beta5. The
0.9.4 version is incompatible and cannot be (easily) installed.

Hi all,

A few months ago I was playing round with a JS/Ajax/php data-table (as
a faster solution to XML Databinding)...  (example
http://www.icommunicate.co.uk/tables/)

We stumbled upon a big problem with getting IE to behave and cache the
AJAX requests that are being made in the background - basically we
couldn't the eTags hooked up..

Anyway - having watched Steve Souders great talk on YouTube and read
the bit about eTag escaping in
http://developer.yahoo.com/performance/rules.html#etags ("The only
format constraints are that the string be quoted.") everything seems
to be working in IE as well as it was in FF! :-)

Just wanted to say thanks and, to anyone else that's trying to use
eTags to control whether to 304 AJAX requests that little note is
pretty important!

HTH,
Jimbo

There was a thread about this a while ago, started by me following
seeing a blog post suggesting that disabling Last-Modified would help,
as browsers would be more inclined to honour the Expires (or even
Etags) - which I think is what you are suggesting.

However on testing (bothing a developerment site with IE and Firefox,
and on a live website - with real traffic) it was not really the case.
Even with Expires set browsers would request the object again more
often at least when the user pressed F5 - possibly other cases (I
observe a high rate of them, but I could only reproduce pressing F5) -
or it could be users disabled caching (IE offers this )*

So my conclusion was to leave them on - at least that way the
webserver can usually return a 304 for these repeat requests.

Yes I know Etags are meant to offer similar functionality, but from
what I can tell they are not as widly supported as Last-Modified.

One thing I learnt is the Last-Modifed check at the server end can be
a simple string comparison, I was parsing the date and comparing
numbers, but that is not needed, the browser seems to store it as a
string. This also allows you to use fake dates, if you dont want to
disclose real dates (if that is your objection to Last-Modified) -
although someone please correct me if this is not good idea!


* One mitigating circumstance which only came to light later, is the
static content was served from a subdomain of the main domain, so
cookies where still used (we didnt define a server name) - so that
could of lowered the browsers reliance on Expires. Will have to test
it again nwo no cookies are invoved in static content.




On Tue, Apr 8, 2008 at 12:11 PM, Rakesh Rajan <rakeshxp@...> wrote:
>
>  We are trying to implement some of the performance rules in LifeBlob.
>
> A sample header ( for a resource file ) looks like :
>
>
> DateTue, 08 Apr 2008 11:08:16 GMT
> ServerApache
> Last-ModifiedWed, 02 Apr 2008 19:15:29 GMT
> Accept-Ranges bytes
> Cache-Controlmax-age=34560000
> ExpiresWed, 08 Apr 2009 11:08:16 GMT
> VaryAccept-Encoding
> Content-Encodinggzip
>  Content-Length9236
> Connectionclose
>  Content-Typetext/css
> So the question I have is around Last-Modified header. Is this header really
> necessary since I have all the caching headers present?  Also, I am planning
> to turn on ETags.
>
> Thanks,
> Rakesh Rajan
>



--
Barry

- www.nearby.org.uk - www.geograph.org.uk -

Rakesh Rajan wrote:
> I missed a point in the last mail. When I looked at the headers in case of
> Yahoo, they too include Last-Modified ( inspite of having all caching
> headers). So what is the advantage of having this header ? ( Assuming ETag
> is on )

Last-Modified and ETag headers are quite different from cache control
headers. They are used to _Revalidate_ cached copies of objects in a
conditional GET (note that it's quite likely that an expired copy is
still a valid copy).

You might want to enable both Last-Modified and ETag in anticipation of
cases when it's possible for an object to be "modified" but not actually
changed or significantly enough to be considered changed, for example:
on unix you can touch a file to change its modified timestamp without
altering the content.


> -Rakesh


--
Zhang Yining
URL:         http://www.zhangyining.net | http://www.yining.org
mailto:      yining@... | zhang.yining@...
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