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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.

220 questions
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YSlow giving inconsistent results on ETags

When I run YSlow against my site, I get an "F" on the "Configure ETags" item; it claims that there are no etags for many (all?) of my images, stylesheets, etc. However, if I run the test on one of those images directly, I get an A on the etag test.…
Craig Walker
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CSS/HTML: Does using max-height on images help HTML rendering?

I just finished reading YSlow recommendation to always define the image dimensions (height/width) to improve HTML rendering performance. However, I don't know the image dimension I'm linking too. What I do know is that the height will never be…
JasonK
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Remove wrapper div from rails hidden fields

I was wondering if it's somehow possible to remove the wrapper div from Rails hidden inputs that are automatically generated on forms? The reason is that it's giving me a 'B' on my ySlow report and telling me to avoid CSS expressions. I know this…
anthony
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Seeing duplicate http requests in server logs

I have started a small django application in my machine. When i have seen the request logs I figured out that It is actually logging the same requests twice. After a little investigation, I disabled all of my add-ons in my browser and tried. To my…
leela
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Cant find why some small images are taking 10 seconds to load

I am trying to optimize my site to accomplish at least 90 on YSlow and PageSpeed. I am doing pretty well. But in the following result, there are 4 images that show that take 9-10 seconds to load. If you see the detail, it actually shows that of…
Luis Valencia
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Yslow doesnt recognize my gzip

my site is all happily Gzipped according to: http://www.gidnetwork.com/tools/gzip-test.php However when I run it through Yslow I get a F for Gzip and it lists all of my scripts as components that are not gzipped. Any ideas ?
Zac
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No expires header

I have the report from YSlow: (no expires) http://static3.scirra.net/avatars/128/40cfdcbd1b1ec1842e199c97c4b85a4a.png (And a lot more similar). In my web.config though, I have: …
Tom Gullen
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Apache Benchmark Document Length vs YSlow Page's Total Weight

I'm load testing my page with Apache Benchmark: ab -n 20 -c 5 http://localhost/mysite/index/index I know that Document Length stands for the sum of all HTML images,CSS,JS and anything within the response in bytes. If I go over Firefox and I run…
luca
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tools.gzip appears not to compress content in cherrypy

I'm reviewing my development site with the Yslow tool under Chrome and Firefox, and one of the suggestions is that I gzip appropriate content. As a starting point I just added "tools.gzip.on = True" to my [/] configuration. I know the…
Steve Ferguson
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YSlow recommendations. In IIS, why wouldn't Enable Content Expiration be checked by default in

i just ran yslow against my website and i had a question around Expiry Headers: YSlow gave me an : Grade F on Add Expires headers. There are 20 static components without a far-future expiration date. These are all css or js files. Right now when…
leora
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How to maintain good PageSpeed Rank with external services

So I'm grappling with brutal ranking degradation due to external services used in client sites. I've pretty much done everything I feel I have control over, including resolving render-blocking problems. But one thing that runs like a red thread…
jschreck
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Combining JavaScript files as recommended by YSlow - optimal size?

We have about 30 external JavaScripts on our page. Each is already minified. To reduce HTTP requests and page load time, we are considering combining them to a single file. This was recommended by the YSlow tool. Is this wise, or is it better to…
frankadelic
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intermitten java slow query to MySQL

In my application server, which is written in JAVA, I have the following symptom: Once or twice per hour, the query to MySQL is extremely slow (8-10s/query). My server queries to 2 different database servers, and both of them have this symptom, but…
Eddie Bui
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is this true? "Gzipped items will not have the same etags (even if the content did not change)"

Is it true that we should disable etags if we are compressing with apache because the etags will be different each time? Is it true for deflate too? Thanks
benjisail
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Using Request, HttpNtlmAuth to make a system call with authentication

I've got the following snip of code the has the audacity to tell me it is "FAIL to load undefnied" (the nerve...) I'm trying to pass my authenticated session to a system call that uses javascript. import requests from requests_ntlm import…
MinimalMaximizer
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