Welcome!

Eclipse Authors: David H Deans, Liz McMillan, JP Morgenthal, Mano Marks, Yeshim Deniz

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 Technical Product Marketing Manager at Instart Logic. Dawn has had a passion for web performance for over 15 years with a focus on how to make the web faster. As a technical product marketing manager at Instart Logic, she researches and writes about trends in the web performance space and how they impact the user experience. Prior to joining Instart Logic, Dawn worked at F5 Networks, Gomez & Empirix.

@ThingsExpo Stories
"We're a cybersecurity firm that specializes in engineering security solutions both at the software and hardware level. Security cannot be an after-the-fact afterthought, which is what it's become," stated Richard Blech, Chief Executive Officer at Secure Channels, in this SYS-CON.tv interview at @ThingsExpo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
Consumers increasingly expect their electronic "things" to be connected to smart phones, tablets and the Internet. When that thing happens to be a medical device, the risks and benefits of connectivity must be carefully weighed. Once the decision is made that connecting the device is beneficial, medical device manufacturers must design their products to maintain patient safety and prevent compromised personal health information in the face of cybersecurity threats. In his session at @ThingsExpo...
SYS-CON Events announced today that Grape Up will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct. 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Grape Up is a software company specializing in cloud native application development and professional services related to Cloud Foundry PaaS. With five expert teams that operate in various sectors of the market across the U.S. and Europe, Grape Up works with a variety of customers from emergi...
Detecting internal user threats in the Big Data eco-system is challenging and cumbersome. Many organizations monitor internal usage of the Big Data eco-system using a set of alerts. This is not a scalable process given the increase in the number of alerts with the accelerating growth in data volume and user base. Organizations are increasingly leveraging machine learning to monitor only those data elements that are sensitive and critical, autonomously establish monitoring policies, and to detect...
SYS-CON Events announced today that Massive Networks will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Massive Networks mission is simple. To help your business operate seamlessly with fast, reliable, and secure internet and network solutions. Improve your customer's experience with outstanding connections to your cloud.
Everything run by electricity will eventually be connected to the Internet. Get ahead of the Internet of Things revolution and join Akvelon expert and IoT industry leader, Sergey Grebnov, in his session at @ThingsExpo, for an educational dive into the world of managing your home, workplace and all the devices they contain with the power of machine-based AI and intelligent Bot services for a completely streamlined experience.
Because IoT devices are deployed in mission-critical environments more than ever before, it’s increasingly imperative they be truly smart. IoT sensors simply stockpiling data isn’t useful. IoT must be artificially and naturally intelligent in order to provide more value In his session at @ThingsExpo, John Crupi, Vice President and Engineering System Architect at Greenwave Systems, will discuss how IoT artificial intelligence (AI) can be carried out via edge analytics and machine learning techn...
In the enterprise today, connected IoT devices are everywhere – both inside and outside corporate environments. The need to identify, manage, control and secure a quickly growing web of connections and outside devices is making the already challenging task of security even more important, and onerous. In his session at @ThingsExpo, Rich Boyer, CISO and Chief Architect for Security at NTT i3, discussed new ways of thinking and the approaches needed to address the emerging challenges of security i...
SYS-CON Events announced today that Datera, that offers a radically new data management architecture, has been named "Exhibitor" of SYS-CON's 21st International Cloud Expo ®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Datera is transforming the traditional datacenter model through modern cloud simplicity. The technology industry is at another major inflection point. The rise of mobile, the Internet of Things, data storage and Big...
SYS-CON Events announced today that GrapeUp, the leading provider of rapid product development at the speed of business, will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Grape Up is a software company, specialized in cloud native application development and professional services related to Cloud Foundry PaaS. With five expert teams that operate in various sectors of the market acr...
From 2013, NTT Communications has been providing cPaaS service, SkyWay. Its customer’s expectations for leveraging WebRTC technology are not only typical real-time communication use cases such as Web conference, remote education, but also IoT use cases such as remote camera monitoring, smart-glass, and robotic. Because of this, NTT Communications has numerous IoT business use-cases that its customers are developing on top of PaaS. WebRTC will lead IoT businesses to be more innovative and address...
SYS-CON Events announced today that CA Technologies has been named "Platinum Sponsor" of SYS-CON's 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business - from apparel to energy - is being rewritten by software. From planning to development to management to security, CA creates software that fuels transformation for companies in the applic...
Internet of @ThingsExpo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 21st Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devic...
In his opening keynote at 20th Cloud Expo, Michael Maximilien, Research Scientist, Architect, and Engineer at IBM, discussed the full potential of the cloud and social data requires artificial intelligence. By mixing Cloud Foundry and the rich set of Watson services, IBM's Bluemix is the best cloud operating system for enterprises today, providing rapid development and deployment of applications that can take advantage of the rich catalog of Watson services to help drive insights from the vast t...
Recently, IoT seems emerging as a solution vehicle for data analytics on real-world scenarios from setting a room temperature setting to predicting a component failure of an aircraft. Compared with developing an application or deploying a cloud service, is an IoT solution unique? If so, how? How does a typical IoT solution architecture consist? And what are the essential components and how are they relevant to each other? How does the security play out? What are the best practices in formulating...
In his session at @ThingsExpo, Arvind Radhakrishnen discussed how IoT offers new business models in banking and financial services organizations with the capability to revolutionize products, payments, channels, business processes and asset management built on strong architectural foundation. The following topics were covered: How IoT stands to impact various business parameters including customer experience, cost and risk management within BFS organizations.
SYS-CON Events announced today that Elastifile will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Elastifile Cloud File System (ECFS) is software-defined data infrastructure designed for seamless and efficient management of dynamic workloads across heterogeneous environments. Elastifile provides the architecture needed to optimize your hybrid cloud environment, by facilitating efficient...
SYS-CON Events announced today that Golden Gate University will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Since 1901, non-profit Golden Gate University (GGU) has been helping adults achieve their professional goals by providing high quality, practice-based undergraduate and graduate educational programs in law, taxation, business and related professions. Many of its courses are taug...
SYS-CON Events announced today that DXWorldExpo has been named “Global Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Digital Transformation is the key issue driving the global enterprise IT business. Digital Transformation is most prominent among Global 2000 enterprises and government institutions.
An increasing number of companies are creating products that combine data with analytical capabilities. Running interactive queries on Big Data requires complex architectures to store and query data effectively, typically involving data streams, an choosing efficient file format/database and multiple independent systems that are tied together through custom-engineered pipelines. In his session at @BigDataExpo at @ThingsExpo, Tomer Levi, a senior software engineer at Intel’s Advanced Analytics ...