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Entries for 'Dawn Parzych'

articleperformancewpo April 08, 2014 by Dawn Parzych
Caching is a great way to offload servers and networks; reducing the amount of requests coming into and out of a network. The concept behind the need for caching is simple; store the content most frequently accessed closest to the end user to improve performance. The notion of caching can be applied in many areas: server side caching, client side caching, edge caching, and transparent caching. It is possible when accessing a web page that a user will encounter each of these caches. Server-side C...
article March 28, 2014 by Dawn Parzych
In the previous few posts I’ve discussed the new congestion control algorithms and rate pacing features that are available in BIG-IP 11.5; but if you’re not ready to move to 11.5 there is still plenty that you can do to optimize your TCP profiles. Adjusting the Initial Congestion Window Size The initial congestion window is a key component of slow start, or the exponential growth phase. Historically the initial congestion window has been 2, which means that slow start ramps up from 2 to 4 to 8 t...
article March 25, 2014 by Dawn Parzych
  Have you ever gotten frustrated when you were browsing on your mobile phone and all of a sudden the connection dropped and you had to resubmit the request or you lost all of the data you had filled out in the form? Traditional TCP is a single path protocol; when the path fails the session is terminated and a new connection needs to be established. When a mobile device switches between the mobile network and wi-fi network, a new connection needs to be established which causes delays and al...
TCP congestion control strives to optimize network goodput while minimizing packet loss by moderating transmission speed. Unfortunately, the way that congestion control moderates transmission often results in microbursts which can overflow buffers on switches and routers. This packet loss in turn triggers congestion control to moderate transmission speeds by reducing the congestion window; TCP then ramps up and the cycle repeats. This oscillation between under and over utilization of the network...
article February 27, 2014 by Dawn Parzych
Over the last several years the rise of the smartphone has led to substantially increased capabilities in mobile devices. The emergence of applications for these platforms has enabled a near limitless number of ways for consumers and enterprise users to interact with people, systems and businesses. Supporting much more than telephony, today’s phones function as a primary source of Internet and application access. Why Is the Mobile Experience So Important?A poor end-user experience on a mobile de...
articleaccelerationoptimizationtcp February 06, 2014 by Dawn Parzych
The foundation of the Internet is TCP, it includes the rules for formatting messages, handling congestion, error correction and provides information on where a packet should be delivered, whether it arrived too quickly for the receiving computer and whether it arrived at all. Basically TCP is the glue that ensures network conditions work smoothly. As the way people connect to the internet has changed from 2400 baud modems to high speed fiber to the home and mobile connectivity – TCP is being str...
articleperformanceaccelerationus June 19, 2009 by Dawn Parzych
Earlier this week the Fast Web Race announced that the rules for the contest have changed slightly.  There are now two categories – one for sites looking for improvement and one for sites that want to brag about how they’ve achieved performance improvements.  The rules of category one haven’t changed so if you’re looking for some free advice on how to improve your web sites performance sign up now.  For those looking to brag about all the hard work that was devoted to improving their web appli...
Recently I wrote about Firefox using the Expires header as opposed to the max-age Cache-Control header.  It was pointed out that the bug tracking this is marked as closed.  I was very excited by this news and when I saw the news yesterday that Firefox had released a preview of 3.5 I decided to check and see if this bug fix had made it into 3.5.  Needless to say I was very disappointed to still see that the incorrect caching behavior exists - the Expires header overrides the Cache-Control header....
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 Sp...
Being the total acceleration junkie that I am the first time a new site is launched or recommended to me the first thing I do is take a look at the performance of it.  So when I heard about Bing the first thing I did was fire up HttpWatch and take a look at the site.  To make things a little more interesting I decided to compare the results to Google, I used the classic home page and not my customized iGoogle home page. Tests were conducted from my home broadband connection in London, England....
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