Click here to close now.

Welcome!

Eclipse Authors: XebiaLabs Blog, Ken Fogel, Sematext Blog, Marcin Warpechowski, Trevor Parsons

Blog Feed Post

Page Speed v1.0 VS YSlow v2.0

Last week Google announced a new open source plug-in for Firefox called Page Speed which can be used to assess the performance of web pages and make recommendations on speeding up the delivery.  To me this sounded a lot like Yslow, of course that plug-in was developed and maintained by Yahoo! so it does make sense that Google would want to come up with their own version.  As I hadn't yet upgraded to YSlow 2.0 I figured this was a good time to see what the new version had to offer and how Page Speed compares. All testing was conducted on the DevCentral home page with a unpopulated cache.

The first problem I encountered with both is that I currently am using Firefox 3.5 beta and Firebug 1.4 neither of the two add-ons currently provide support for these beta releases.  This meant reverting back to Firefox 3.0 and Firebug 1.3.3.  The next incompatibility I found was with Page Speed and HttpWatch.  These two add-ons are considered incompatible when it comes to the Page Speed Activity tab. 

 

imageThe warning message is rather vague and not to be deterred I went ahead and tested what would happen if I imageran the two together.   I was able to run both the Page Speed Activity report and HttpWatch at the same however the resulting graphs from Page Speed were illegible.  The two add-ons when run at the same time provided different response time results Page Speed said the page took 16 seconds while HttpWatch showed only 14.4 seconds.

YSlow on the other hand does not present any incompatibility warning message and the response time results are quite similar 12. 735 seconds for HttpWatch and 12.744 seconds for YSlow.  

 

 

On of the nicest new features of YSlow 2.0 is the ability to customize the rules that are applied.  There are 3 default rulesets YSlow (v2), Classic, and Small Site or Blog.  The Classic ruleset provides 13 rules while version 2 has added 9 additional rules.  I'm a little confused by the Small Site or Blog option as some of the rules that have been de-selected like using an expires header should apply to any site.  Any  of the default rule sets can be customized to add or remove a rule, for example with DevCentral we get an F for use a eContent Delivery Network (CDN) because YSlow doesn't pick up the fact that we have built our own mini-CDN with acceleration solutions from F5 Networks

Now onto some of the recommendations that are provided. 

Browser Caching

For repeat visitors the use of Cache-Control or Expires headers are very useful.  Where YSlow  and Page Speed differ is in the recommendation for how long the content should be cached for.  YSlow recommends 2 days while Page Speed suggests 30 days, I have to say I agree with YSlow on this point.  If there is no way for a browser to recognize if the content that has been cached has changed then a static 30 days expiration may be result in stale content being served to end users.  To use an expiration like 30 days the development process has to change as well to include some sort of versioning to prevent the browser for serving stale content.  Changing the development process isn't always possible which is why a shorter expiration may be needed.  One of the down-sides to YSlow is that they use a default value of 48 hours for the cache if objects are cached for less than this time points are deducted and a low score is provided.   Even though DevCentral uses an expiry between 2 days and 180 days 27 objects are flagged by YSlow as not having a far-future expires.  The items that are flagged are those having a 2 day expiry cache-control headers are set to public, s-maxage=14400, max-age=172800, I believe what is happening here is that between the item being cached and YSlow running the analysis just enough milliseconds have passed to have the content be just under 2 days and therefore trigger the warning. It would be nice if you could configure what was an appropriate expires for your business and have the tools use that value instead of having a value imposed on you. 

Compression

Using GZIP is a great optimisation technique and should be used whenever possible.  While there are about 20 text files on the DevCentral homepage there are 2 that are not compressed which is picked up and flagged by both tools.  It is unfortunately not always possible to compress every single text file.  I have spent hours with customers trying to debug why an application doesn't work when compression is enabled, in the end it turns out to be a single script file that when compressed causes the page functionality to break, disabling compression for the script in question resolves the problem.  If there are multiple compressed files on a page and only 1 or 2 that aren't compressed there may be a reason for it.

Reduce DNS Lookups

Page Speed and YSlow both recommend reducing the number of DNS lookups and have identified the domains the content is coming from.  YSlow provides a score of A even though there are 5 domains.  Page Speed suggests eliminating some of these items - unfortunately that can't be done as these are third party resources that are used for various analysis and tracking - one of which just happens to be from Google.  It seems like YSlow is a little smarter in identifying what these are for and that they can't be reduced.  This  recommendation is actually a little puzzling to me as one way to speed up page download is to spread the requests across multiple domains to allow more items to download in parallel.  Page Speed provides this as a recommendation as well but doesn't this contradict the recommendation to reduce DNS lookups.

 

Generally speaking both tools are valuable in understanding where a site may be slow and where improvements can be made but make sure to investigate whether or not the recommendations work for your application.  There may be reasons why things are the way they are.  It will be interesting to see how these continue to evolve. 

Read the original blog entry...

More Stories By Dawn Parzych

Dawn Parzych is a product manager for F5 Networks, the global leader in Application Delivery Networking. For the past 2 years, she has been in London working as an acceleration architect with F5 customers based in Europe, the Middle East, and Africa. Dawn has helped companies in finance, retail, media, and other industries optimize performance levels and overcome Web application delivery challenges. In her ten years as a Web performance specialist, Dawn has covered everything from load testing to Web performance monitoring to application delivery.

@ThingsExpo Stories
SYS-CON Events announced today that BMC will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. BMC delivers software solutions that help IT transform digital enterprises for the ultimate competitive business advantage. BMC has worked with thousands of leading companies to create and deliver powerful IT management services. From mainframe to cloud to mobile, BMC pairs high-speed digital innovation with robust IT industrialization – allowing customers to provide amazing user experiences with optimized IT per...
SYS-CON Events announced today that MetraTech, now part of Ericsson, has been named “Silver Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9–11, 2015, at the Javits Center in New York, NY. Ericsson is the driving force behind the Networked Society- a world leader in communications infrastructure, software and services. Some 40% of the world’s mobile traffic runs through networks Ericsson has supplied, serving more than 2.5 billion subscribers.
The world is at a tipping point where the technology, the device and global adoption are converging to such a point that we will see an explosion of a world where smartphone devices not only allow us to talk to each other, but allow for communication between everything – serving as a central hub from which we control our world – MediaTek is at the heart of both driving this and allowing the markets to drive this reality forward themselves. The next wave of consumer gadgets is here – smart, connected, and small. If your ambitions are big, so are ours. In his session at @ThingsExpo, Jack Hu, D...
SYS-CON Events announced today that DragonGlass, an enterprise search platform, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. After eleven years of designing and building custom applications, OpenCrowd has launched DragonGlass, a cloud-based platform that enables the development of search-based applications. These are a new breed of applications that utilize a search index as their backbone for data retrieval. They can easily adapt to new data sets and provide access to both structured and unstruc...
The 4th International Internet of @ThingsExpo, co-located with the 17th International Cloud Expo - to be held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA - announces that its Call for Papers is open. The Internet of Things (IoT) is the biggest idea since the creation of the Worldwide Web more than 20 years ago.
We’re entering a new era of computing technology that many are calling the Internet of Things (IoT). Machine to machine, machine to infrastructure, machine to environment, the Internet of Everything, the Internet of Intelligent Things, intelligent systems – call it what you want, but it’s happening, and its potential is huge. IoT is comprised of smart machines interacting and communicating with other machines, objects, environments and infrastructures. As a result, huge volumes of data are being generated, and that data is being processed into useful actions that can “command and control” thi...
As the Internet of Things unfolds, mobile and wearable devices are blurring the line between physical and digital, integrating ever more closely with our interests, our routines, our daily lives. Contextual computing and smart, sensor-equipped spaces bring the potential to walk through a world that recognizes us and responds accordingly. We become continuous transmitters and receivers of data. In his session at @ThingsExpo, Andrew Bolwell, Director of Innovation for HP's Printing and Personal Systems Group, discussed how key attributes of mobile technology – touch input, sensors, social, and ...
All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades. With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo, June 9-11, 2015, at the Javits Center in New York City. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be
The Internet of Things is not only adding billions of sensors and billions of terabytes to the Internet. It is also forcing a fundamental change in the way we envision Information Technology. For the first time, more data is being created by devices at the edge of the Internet rather than from centralized systems. What does this mean for today's IT professional? In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will addresses this very serious issue of profound change in the industry.
WebRTC defines no default signaling protocol, causing fragmentation between WebRTC silos. SIP and XMPP provide possibilities, but come with considerable complexity and are not designed for use in a web environment. In his session at @ThingsExpo, Matthew Hodgson, technical co-founder of the Matrix.org, discussed how Matrix is a new non-profit Open Source Project that defines both a new HTTP-based standard for VoIP & IM signaling and provides reference implementations.
Buzzword alert: Microservices and IoT at a DevOps conference? What could possibly go wrong? In this Power Panel at DevOps Summit, moderated by Jason Bloomberg, the leading expert on architecting agility for the enterprise and president of Intellyx, panelists will peel away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you'll have no problem fil...
"People are a lot more knowledgeable about APIs now. There are two types of people who work with APIs - IT people who want to use APIs for something internal and the product managers who want to do something outside APIs for people to connect to them," explained Roberto Medrano, Executive Vice President at SOA Software, in this SYS-CON.tv interview at Cloud Expo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Almost everyone sees the potential of Internet of Things but how can businesses truly unlock that potential. The key will be in the ability to discover business insight in the midst of an ocean of Big Data generated from billions of embedded devices via Systems of Discover. Businesses will also need to ensure that they can sustain that insight by leveraging the cloud for global reach, scale and elasticity.
In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect at GE, and Ibrahim Gokcen, who leads GE's advanced IoT analytics, focused on the Internet of Things / Industrial Internet and how to make it operational for business end-users. Learn about the challenges posed by machine and sensor data and how to marry it with enterprise data. They also discussed the tips and tricks to provide the Industrial Internet as an end-user consumable service using Big Data Analytics and Industrial Cloud.
Building low-cost wearable devices can enhance the quality of our lives. In his session at Internet of @ThingsExpo, Sai Yamanoor, Embedded Software Engineer at Altschool, provided an example of putting together a small keychain within a $50 budget that educates the user about the air quality in their surroundings. He also provided examples such as building a wearable device that provides transit or recreational information. He then reviewed the resources available to build wearable devices at home including open source hardware, the raw materials required and the options available to power s...
How do APIs and IoT relate? The answer is not as simple as merely adding an API on top of a dumb device, but rather about understanding the architectural patterns for implementing an IoT fabric. There are typically two or three trends: Exposing the device to a management framework Exposing that management framework to a business centric logic Exposing that business layer and data to end users. This last trend is the IoT stack, which involves a new shift in the separation of what stuff happens, where data lives and where the interface lies. For instance, it's a mix of architectural styles ...
We certainly live in interesting technological times. And no more interesting than the current competing IoT standards for connectivity. Various standards bodies, approaches, and ecosystems are vying for mindshare and positioning for a competitive edge. It is clear that when the dust settles, we will have new protocols, evolved protocols, that will change the way we interact with devices and infrastructure. We will also have evolved web protocols, like HTTP/2, that will be changing the very core of our infrastructures. At the same time, we have old approaches made new again like micro-services...
Connected devices and the Internet of Things are getting significant momentum in 2014. In his session at Internet of @ThingsExpo, Jim Hunter, Chief Scientist & Technology Evangelist at Greenwave Systems, examined three key elements that together will drive mass adoption of the IoT before the end of 2015. The first element is the recent advent of robust open source protocols (like AllJoyn and WebRTC) that facilitate M2M communication. The second is broad availability of flexible, cost-effective storage designed to handle the massive surge in back-end data in a world where timely analytics is e...
Collecting data in the field and configuring multitudes of unique devices is a time-consuming, labor-intensive process that can stretch IT resources. Horan & Bird [H&B], Australia’s fifth-largest Solar Panel Installer, wanted to automate sensor data collection and monitoring from its solar panels and integrate the data with its business and marketing systems. After data was collected and structured, two major areas needed to be addressed: improving developer workflows and extending access to a business application to multiple users (multi-tenancy). Docker, a container technology, was used to ...
The true value of the Internet of Things (IoT) lies not just in the data, but through the services that protect the data, perform the analysis and present findings in a usable way. With many IoT elements rooted in traditional IT components, Big Data and IoT isn’t just a play for enterprise. In fact, the IoT presents SMBs with the prospect of launching entirely new activities and exploring innovative areas. CompTIA research identifies several areas where IoT is expected to have the greatest impact.