MatrixAdapt | Logiciel de gestion d'Entreprise, Création et référencement des sites web

Seo Master present to you: By Tom Stocky, Director, Google Developer Products

We recently announced a System Status Dashboard for Google App Engine. As developers depend on App Engine for important applications, we wanted to provide more visibility into App Engine's availability and performance.

Application development today is pretty different than it was just a few years ago. Most web apps now make use of hosted third-party services for features like search, maps, video, or translation (e.g., our AJAX APIs). These services mean developers don't have to invest in massive computing resources to build these features themselves, and can instead focus on what is exciting and new about their apps.

Building in dependencies to third-party services or moving to a new hosting infrastructure is not something developers take lightly. This new App Engine dashboard provides some of the same monitoring data that we use internally, so you can make informed decisions about your hosting infrastructure.

Learn more (about this and other recent announcements) in the App Engine blog and please let us know what you think.2013, By: Seo Master

Seo Master present to you: By Steve Lamm, Member of Technical Staff

Let's say you figured out a wicked-cool way to speed up how quickly your website loads. You know with great certainty that the most popular web page will load much, much faster. Then, you remember that the page always loads much, much faster in your browser with the web server running on your development box. You need numbers that represent what your users will actually experience.

Depending on your development process, you may have several measuring opportunities such as after a live release, on a staging server, on a continuous build, or on your own development box.

Only a live release gives numbers that users experience--through different types of connections, different computers, different browsers. But, it comes with some challenges:

• You must instrument your site (one example tool is jiffy-web).
• You must isolate changes.
  • The most straight-forward way to do that is to release only one change at a time. That avoids having multiple changes altering performance numbers--for better or for worse--at the same time.
• Consider releasing changes to a subset of users.
  • That helps safe-guard against real-world events like holidays, big news days, exploding hard drives, and, perhaps the worst possible fate of all: a slashdotting.

Measuring real traffic is important, but performance should also be measured earlier in the development process. Millions of users will not hit your development web server--they won't, right?! You need a way to measure your pages without that.

Today, Steve Souders has released Hammerhead, a Firefox plug-in that is just the ticket for measuring web page load times. It has a sweet feature that repeatedly loads pages both with and without the browser cache so you can understand different use cases. One thing Hammerhead will not do for you is slow down your web connection. The page load times that you measure on your development machine will likely be faster than your users' wildest dreams.

Measuring page load times with a real DSL or dial up connection would be ideal, but if you cannot do that, all hope is not lost. You can try the following tools that simulate slower connection speeds on a single box:

• Firefox Throttle (Firefox plug-in, windows-only, free)
• Fiddler: Web Debugging Proxy (free)
• Charles: Web Debugging Proxy (shareware, $50)

Please share your own favorite tools in the comments. Each of these tools is super easy to install and setup options to simulate slower connections. However, they each have some caveats that you need to keep in mind.

Firefox Throttle hooks into the WinSock API to limit bandwidth and avoids using proxy settings. (If you use it, be sure to disable "burst-mode".) Right now, Firefox Throttle only limits bandwidth. That means it controls how much data arrives in a given time period after the first bits arrive. It does not limit latency. Latency controls how long it takes packets to travel to and from the server. See Wikipedia's Relationship between latency and throughput for more details. For certain webpages, latency can make up a large part of the overall load time. The next Firefox Throttle release is expected to include latency delays and other webmaster friendly features to simulate slower, less-reliable connections. With these enhancements, Firefox Throttle will be an easy recommendation.

Fiddler and Charles act as proxies, and, as a result they make browsers act rather differently. For instance, IE and Firefox drastically limit the maximum number of connections (IE8 from 60+ to 6 and FF3 from 30 to 8). If you happen to know that all your users go though a proxy anyway, then this will not matter to you. Otherwise, it can mean that web pages load substantially differently.

If you have more time and hardware with which to tinker, you may want to check out tools like dummynet (FreeBSD or Mac OS X), or netem (Linux). They have even more knobs and controls and can be put between the web browser hardware and the serving hardware.

Measurements at each stage of web development can guide performance improvements. Hammerhead combined with a connection simulator like Firefox Throttle can be a great addition to your web development tool chest.2013, By: Seo Master

salam every one, this is a topic from google web master centrale blog: Webmaster level: intermediate

At Google, we’re striving to make the whole web fast. As part of that effort, we’re launching a new web-based tool in Google Labs, Page Speed Online, which analyzes the performance of web pages and gives specific suggestions for making them faster. Page Speed Online is available from any browser, at any time. This allows website owners to get immediate access to Page Speed performance suggestions so they can make their pages faster.

In addition, we’ve added a new feature: the ability to get Page Speed suggestions customized for the mobile version of a page, specifically smartphones. Due to the relatively limited CPU capabilities of mobile devices, the high round-trip times of mobile networks, and rapid growth of mobile usage, understanding and optimizing for mobile performance is even more critical than for the desktop, so Page Speed Online now allows you to easily analyze and optimize your site for mobile performance. The mobile recommendations are tuned for the unique characteristics of mobile devices, and contain several best practices that go beyond the recommendations for desktop browsers, in order to create a faster mobile experience. New mobile-targeted best practices include eliminating uncacheable landing page redirects and reducing the amount of JavaScript parsed during the page load, two common issues that slow down mobile pages today.


Page Speed Online is powered by the same Page Speed SDK that powers the Chrome and Firefox extensions and webpagetest.org.

Please give Page Speed Online a try. We’re eager to hear your feedback on our mailing list and how you’re using it to optimize your site.

Posted by Andrew Oates and Richard Rabbat, Page Speed teamthis is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com

salam every one, this is a topic from google web master centrale blog: Webmaster level: Advanced

Two years ago we released the Page Speed browser extension and earlier this year the Page Speed Online API to provide developers with specific suggestions to make their web pages faster. Last year we released mod_pagespeed, an Apache module, to automatically rewrite web pages. To further simplify the life of webmasters and to avoid the hassles of installation, today we are releasing the latest addition to the Page Speed family: Page Speed Service.

Page Speed Service is an online service that automatically speeds up loading of your web pages. To use the service, you need to sign up and point your site’s DNS entry to Google. Page Speed Service fetches content from your servers, rewrites your pages by applying web performance best practices, and serves them to end users via Google's servers across the globe. Your users will continue to access your site just as they did before, only with faster load times. Now you don’t have to worry about concatenating CSS, compressing images, caching, gzipping resources or other web performance best practices.

In our testing we have seen speed improvements of 25% to 60% on several sites. But we know you care most about the numbers for your site, so check out how much Page Speed Service can speed up your site. If you’re encouraged by the results, please sign up. If not, be sure to check back later. We are diligently working on adding more improvements to the service.

At this time, Page Speed Service is being offered to a limited set of webmasters free of charge. Pricing will be competitive and details will be made available later. You can request access to the service by filling out this web form.

Posted by Ram Ramani, Engineering Managerthis is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com