|By Dawn Parzych||
|June 8, 2009 11:22 AM EDT||
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.
The warning message is rather vague and not to be deterred I went ahead and tested what would happen if I ran 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.
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.
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.
"There is a natural synchronization between the business models, the IoT is there to support ,” explained Brendan O'Brien, Co-founder and Chief Architect of Aria Systems, in this SYS-CON.tv interview at the 15th International Cloud Expo®, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Nov. 23, 2014 12:00 PM EST Reads: 1,519
The major cloud platforms defy a simple, side-by-side analysis. Each of the major IaaS public-cloud platforms offers their own unique strengths and functionality. Options for on-site private cloud are diverse as well, and must be designed and deployed while taking existing legacy architecture and infrastructure into account. Then the reality is that most enterprises are embarking on a hybrid cloud strategy and programs. In this Power Panel at 15th Cloud Expo (http://www.CloudComputingExpo.com), moderated by Ashar Baig, Research Director, Cloud, at Gigaom Research, Nate Gordon, Director of T...
Nov. 23, 2014 07:45 AM EST Reads: 1,383
The definition of IoT is not new, in fact it’s been around for over a decade. What has changed is the public's awareness that the technology we use on a daily basis has caught up on the vision of an always on, always connected world. If you look into the details of what comprises the IoT, you’ll see that it includes everything from cloud computing, Big Data analytics, “Things,” Web communication, applications, network, storage, etc. It is essentially including everything connected online from hardware to software, or as we like to say, it’s an Internet of many different things. The difference ...
Nov. 22, 2014 10:00 PM EST Reads: 1,187
Cloud Expo 2014 TV commercials will feature @ThingsExpo, which was launched in June, 2014 at New York City's Javits Center as the largest 'Internet of Things' event in the world.
Nov. 22, 2014 05:30 PM EST Reads: 1,354
An entirely new security model is needed for the Internet of Things, or is it? Can we save some old and tested controls for this new and different environment? In his session at @ThingsExpo, New York's at the Javits Center, Davi Ottenheimer, EMC Senior Director of Trust, reviewed hands-on lessons with IoT devices and reveal a new risk balance you might not expect. Davi Ottenheimer, EMC Senior Director of Trust, has more than nineteen years' experience managing global security operations and assessments, including a decade of leading incident response and digital forensics. He is co-author of t...
Nov. 22, 2014 05:30 PM EST Reads: 1,184
ARMONK, N.Y., Nov. 20, 2014 /PRNewswire/ -- IBM (NYSE: IBM) today announced that it is bringing a greater level of control, security and flexibility to cloud-based application development and delivery with a single-tenant version of Bluemix, IBM's platform-as-a-service. The new platform enables developers to build ap...
Nov. 22, 2014 05:30 PM EST Reads: 1,406
Explosive growth in connected devices. Enormous amounts of data for collection and analysis. Critical use of data for split-second decision making and actionable information. All three are factors in making the Internet of Things a reality. Yet, any one factor would have an IT organization pondering its infrastructure strategy. How should your organization enhance its IT framework to enable an Internet of Things implementation? In his session at Internet of @ThingsExpo, James Kirkland, Chief Architect for the Internet of Things and Intelligent Systems at Red Hat, described how to revolutioniz...
Nov. 21, 2014 09:15 PM EST Reads: 1,296
The security devil is always in the details of the attack: the ones you've endured, the ones you prepare yourself to fend off, and the ones that, you fear, will catch you completely unaware and defenseless. The Internet of Things (IoT) is nothing if not an endless proliferation of details. It's the vision of a world in which continuous Internet connectivity and addressability is embedded into a growing range of human artifacts, into the natural world, and even into our smartphones, appliances, and physical persons. In the IoT vision, every new "thing" - sensor, actuator, data source, data con...
Nov. 21, 2014 08:00 PM EST Reads: 1,313
Technology is enabling a new approach to collecting and using data. This approach, commonly referred to as the "Internet of Things" (IoT), enables businesses to use real-time data from all sorts of things including machines, devices and sensors to make better decisions, improve customer service, and lower the risk in the creation of new revenue opportunities. In his General Session at Internet of @ThingsExpo, Dave Wagstaff, Vice President and Chief Architect at BSQUARE Corporation, discuss the real benefits to focus on, how to understand the requirements of a successful solution, the flow of ...
Nov. 21, 2014 08:00 PM EST Reads: 1,367
"BSQUARE is in the business of selling software solutions for smart connected devices. It's obvious that IoT has moved from being a technology to being a fundamental part of business, and in the last 18 months people have said let's figure out how to do it and let's put some focus on it, " explained Dave Wagstaff, VP & Chief Architect, at BSQUARE Corporation, in this SYS-CON.tv interview at @ThingsExpo, held Nov 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Nov. 21, 2014 07:00 PM EST Reads: 1,237
Focused on this fast-growing market’s needs, Vitesse Semiconductor Corporation (Nasdaq: VTSS), a leading provider of IC solutions to advance "Ethernet Everywhere" in Carrier, Enterprise and Internet of Things (IoT) networks, introduced its IStaX™ software (VSC6815SDK), a robust protocol stack to simplify deployment and management of Industrial-IoT network applications such as Industrial Ethernet switching, surveillance, video distribution, LCD signage, intelligent sensors, and metering equipment. Leveraging technologies proven in the Carrier and Enterprise markets, IStaX is designed to work ac...
Nov. 20, 2014 09:15 PM EST Reads: 1,332
C-Labs LLC, a leading provider of remote and mobile access for the Internet of Things (IoT), announced the appointment of John Traynor to the position of chief operating officer. Previously a strategic advisor to the firm, Mr. Traynor will now oversee sales, marketing, finance, and operations. Mr. Traynor is based out of the C-Labs office in Redmond, Washington. He reports to Chris Muench, Chief Executive Officer. Mr. Traynor brings valuable business leadership and technology industry expertise to C-Labs. With over 30 years' experience in the high-tech sector, John Traynor has held numerous...
Nov. 20, 2014 06:00 PM EST Reads: 1,283
Bit6 today issued a challenge to the technology community implementing Web Real Time Communication (WebRTC). To leap beyond WebRTC’s significant limitations and fully leverage its underlying value to accelerate innovation, application developers need to consider the entire communications ecosystem.
Nov. 20, 2014 04:45 PM EST Reads: 1,067
The 3rd International @ThingsExpo, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that it is now accepting Keynote Proposals. 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 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.
Nov. 20, 2014 01:00 PM EST Reads: 1,529
The Internet of Things is not new. Historically, smart businesses have used its basic concept of leveraging data to drive better decision making and have capitalized on those insights to realize additional revenue opportunities. So, what has changed to make the Internet of Things one of the hottest topics in tech? In his session at @ThingsExpo, Chris Gray, Director, Embedded and Internet of Things, discussed the underlying factors that are driving the economics of intelligent systems. Discover how hardware commoditization, the ubiquitous nature of connectivity, and the emergence of Big Data a...
Nov. 20, 2014 12:30 PM EST Reads: 1,761
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.
Nov. 18, 2014 09:00 PM EST Reads: 1,996
SYS-CON Events announced today that Windstream, a leading provider of advanced network and cloud communications, 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. Windstream (Nasdaq: WIN), a FORTUNE 500 and S&P 500 company, is a leading provider of advanced network communications, including cloud computing and managed services, to businesses nationwide. The company also offers broadband, phone and digital TV services to consumers primarily in rural areas.
Nov. 18, 2014 08:15 PM EST Reads: 1,575
SYS-CON Events announced today that IDenticard 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. IDenticard™ is the security division of Brady Corp (NYSE: BRC), a $1.5 billion manufacturer of identification products. We have small-company values with the strength and stability of a major corporation. IDenticard offers local sales, support and service to our customers across the United States and Canada. Our partner network encompasses some 300 of the world's leading systems integrators and security s...
Nov. 18, 2014 08:15 PM EST Reads: 1,523
IoT is still a vague buzzword for many people. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. He also discussed how IoT is perceived by investors and how venture capitalist access this space. Other topics discussed were barriers to success, what is new, what is old, and what the future may hold. Mike Kavis is Vice President & Principal Cloud Architect at Cloud Technology Pa...
Nov. 18, 2014 01:30 PM EST Reads: 1,991
Cloud Expo 2014 TV commercials will feature @ThingsExpo, which was launched in June, 2014 at New York City's Javits Center as the largest 'Internet of Things' event in the world. The next @ThingsExpo will take place November 4-6, 2014, at the Santa Clara Convention Center, in Santa Clara, California. Since its launch in 2008, Cloud Expo TV commercials have been aired and CNBC, Fox News Network, and Bloomberg TV. Please enjoy our 2014 commercial.
Nov. 13, 2014 05:00 AM EST Reads: 3,534