Actually, Yahoo's site is fast for a lot more reasons than just using a CDN. They have been EXTREMELY good at using css sprites, combining/minifying the code,...
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...
Patrick, You're correct - Saying a site is fast simply because they use a CDN is a bit too simple. I look at performance the same way I look at a car. I can...
We are trying to implement some of the performance rules in LifeBlob<http://www.lifeblob.com> . A sample header ( for a resource file ) looks like : DateTue,...
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...
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...
... 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...
Hello I have a question of the response time and the size that Yslow calculate for each page tested First:- How this response time is calculated? Is it the...
Hi Reham, In the Components tab you can see individual response times for each component. You're probably asking about the response time and size that show up...
Thanks Barry for the information. The caching seems fine in FF2 ( but in FF3, the cached resource seems to expire in couple of mins). Regarding cookies in...
Zhang , ... Does this mean that even if only the timestamp of the file is changed ( and the content is still the same ), the server would return a 304 ( even ...
... Do you mean that Etags will do that? Well it depends, properly configured etags, that just depend on the content, would do that. But from what I gather...
... IIRC, if a request comes with both Last-Modified-Since and If-None-Match, then the server should check both. So for such requests, if the modified time has...
That would go back to an American grading system for schools From best to worst it goes from A to F skipping E for some reason.. not to sure on why the system...
... <OT> In the UK, its A-D* then F(ail) then U(nclassified) (although sometimes A-E is used) </OT> ... -- Barry - www.nearby.org.uk - www.geograph.org.uk -...
ETag takes precedence over Last-Modified. In other words, if the If-None-Match test fails then the server doesn't even do the If-Modified-Since check. But in...
... You are right, and looking into apache source code[0] also confirms this. Thanks for correcting my mistake. However, what we are discussing here is...
Understanding that ETags take precedence over Last-Modified dates can, and does have big performance implications in the real world, for both static and...
Hello, I have had some serious problems with YSlow since I started using it but I wonder if it's only happening to me as I see no mention about it on the list....
I've experienced yslow hanging on a different site that had a flash piece. With the piece removed, yslow behaved normally. I've also seen your second problem....
Hi all, I've compiled a new version of IWebMvc, Milestone 3. For those of you that don't know it already, IWebMvc is a flexible web / enterprise platform built...
Thanks for the info Scott, at least now I can get the tabs working if I disable the flash. In case it helps the developers to fix the bug: the flash at ...
Hi Juan, The first problem is fixed in the next YSlow minor release (0.9.5.beta - will be out really soon, probably next week) I'm not sure about the second,...
I've been trying to implement the new "Flush the buffer early [server]" best practice. However, with Apache and mod_gzip it seems that flushing the buffer...
Hi guys, Initially 13, then 14, now http://developer.yahoo.com/performance/ has 34 performance best practices (rules). These will gradually find their way into...
Stoyan, As always, excellent stuff! Thanks so much to the whole team. A proposal for #35 is to ensure the keep-alives are enabled on the webserver. While ...
Brad Bosley
brad.bosley@...
Apr 11, 2008 10:28 pm
375
Hi Stoyan, Excellent news! I'm glad to read that. Is it possible to test or have access to nightlies of YSlow? ... -- Juan Alonso...
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