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Questions tagged [yslow]

a tool written by Yahoo! that analyzes web pages and suggests ways to improve their performance

YSlow is a tool written by Yahoo! that analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.

Currently YSlow is available in several browsers, including recently mobile support.

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YSlow - effective for data intensive sites

I wanted to know that is YSlow effective for any particular kind of web sites , for e.g. would it really help in data intensive sites. And is there any way to test how much improvement (may be what grade it could bring up to) it can give before…
whyAto8
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YSlow, PhantomJS and Jenkins integration

I was going through the YSlow official documentation, and I was a little confused by the Jenkins integration part http://built-url-here is the reachable built page url of your project Because I want to setup so that it can do the speed testing on…
R.R
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Css are declared in Head section still found in body part by YSlow why?

I am using YSlow to measure overall page performance. However, CSS are declared in Head section of the document still YSlow finds css in the body of the document and suggests to put CSS at top. What may be the reason for the same? I am not using…
Krish
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Scripting YSlow and/or PageSpeed

As I'm starting to do some front end engineering at work, I would like to properly quantify the speedup achieved. I would like to be able to use an average value of, say, 50 page load times measured by YSlow or Google Page Speed. Obviously, I…
Leonard Ehrenfried
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Redirect in htaccess to limit sending of cookies

I would like to write a redirect to avoid cookies being sent on graphics & css files. I think what I want is to redirect html and php to www, and others to root, possibly keeping js on the www so scripts can process cookies. This is for Joomla…
Charlie
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Set-Cookie and Expires headers differ

I'm trying to enable Expires headers for images as recommended by YSlow. I'm sure I had this working before but now when I check YSlow it says they are not being cached. For my .htaccess, I have tried: ExpiresActive on ExpiresDefault A0
Matt McCormick
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Is there a way to get Yslow to work with Silverlight or Lightswitch?

I have tryed to run Yslow on a LS/SL application and everytime I run it the yslow application hangs and does not process. Is there anything I can do to make yslow work on SL/LS app?
user1622681
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Why is the last chunk of HTTP download really slow?

i have content length available in the beginning of the download. so i know how much bytes i need to request for. i download in chunks of 1024 bytes. in the last chunk i request for the number of bytes remaining. i am using the read function. but…
Rohit Banga
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Optimize images to YSlow standards using PHP?

I haven't been able to find a clear answer to this question. I want to losslessly optimize my images (mostly jpg) so that it satisfies YSlow's Image Optimization criteria. I haven't been able to determine what steps needed to be taken to do this. I…
Motive
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How to calculate web page download and loading time?

I want to calculate full download of a web page time via PHP. Its possible to use CURL but its only calc download time of HTML source so Its not possible to calc all elements like JS , Images , ... on a page ! I want to program something like…
kamranonline
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How can I enable "keep-alive" if I'm with a web farm/cluster as a webhost, and they don't honor it?

I'm with a webhost for my company's website that has 47 pages (asp.net 4/vb). All speed tests, Google, Yslow, Gtmetrix, etc., want me to enable keep-alive. I have already set http header requests to expire after 30 minutes via IIS7. I submitted a…
Jason Weber
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Will including these javascript files in the header eliminate Etag errors, and other SEO errors from YSlow?

I have been working on performance lately, and recently ran a YSlow test on my company's asp.net website. I have already set up an IIS7 rule to set expiration dates to 30 days. After researching, I think Yahoo suggests you add tags like this to…
Jason Weber
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How to add Expires to Flash and Icon components

Yslow is currently giving Grade B for my site and also for "Add Expires Headers". It says: There is 1 static component without a far-future expiration date. * (no expires) http://localhost/images/favicon.ico The current Expires code in my…
Manoj
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Using yslow with Jenkins and phantomjs

i am trying to access the yslow with phantomjs and jenkins. https://github.com/marcelduran/yslow/wiki/PhantomJS i referred to this url in doing that. In that i can see some screenshots of the jenkins with TAP plugin,but i am not getting how to get…
Pavan b
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Do browsers pre-load images in the CSS file, regardless of use on page?

A friend of mine threw a website I made through the tool at http://analyze.websiteoptimization.com/ . When he came back to me, he insisted that my browser was preloading tons of unrelated images on only the homepage of the site. I came back to him,…
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