Archive | January, 2009
Content Loading – When Being Lazy Pays Off
Building applications on a local area network masks many performance problems that only surface when applications interact with remote users on a wide area network. One common problem is when remote users experience slow web pages that load content (table records, images, videos, PDF files, widgets). These pages tend to perform much slower for remote [...]
Continue reading...Challenges for Branch Office Computing
29. January 2009
This NetworkWorld article was forwarded to me by a colleague and definitely needs mention here. The article (click here) centers around challenges faced in managing ‘branch’ users, whether a small remote office or remote users out of home offices. As companies find innovative and cost effective methods to be more productive, the needs of collaboration and [...]
Continue reading...Performance Best Practices from Citrix
29. January 2009
I get to work with many clients that are deploying applications over Citrix. In general Citrix is a good way to overcome network latency related performance problems and, although I am a big fan of coding applications right the first time, if the hand you were dealt is to manage an application that can’t perform [...]
Continue reading...Fast Web Pages Equal Fast Money
26. January 2009
Improving application performance over the network is the main goal of most people performing application testing, right? Everyone wants their applications to run well for their end users, after all happy end users = a happy and healthy (low stress and high growth) enterprise. We often deal with web based applications and focus on improving [...]
Continue reading...Slow network users take down an IIS based ASP application server
23. January 2009
We often mention the fact that slow network users can impact the server’s ability to scale and consequently degrade user performance (for example here ). This is fundamentally attributed to the fact that slow network users (due to high network latency or limited bandwidth) occupy server resources for longer periods of time per transaction. This [...]
Continue reading...Calling all Application Delivery Engineers
21. January 2009
Whether you’re developing applications or delivering applications, understanding how they will perform over the real world WAN is critical to your success.
Continue reading...The Remote Site Performance Range
21. January 2009
In the previous post I presented an approach for making sure that the network models used in a test are up to date. I also mentioned that in cases where the enterprise network is very dynamic, a more rigorous approach is needed. It is important in these cases to test applications for a range of [...]
Continue reading...Testing 3-G Phone Services in a Virtual Lab
19. January 2009
A couple of weeks ago I had the opportunity to spend some time helping ITT in Mexico City building a lab to test 3G phone services, where Shunra provided the critical element in the testing lab, a complete 3G virtual Wide Area Network. In the lab, network conditions from different service providers in Latin America [...]
Continue reading...Network Emulation Gotcha – does your Network Model match your network?
8. January 2009
Application Performance Testing using Network Emulation is a great way to avoid costly delays and to improve service levels on your Production Network - but only if your emulation tool can model your network accurately.
Continue reading...Keeping Your Network Models Up to Date
7. January 2009
“How do we know that the Shunra VE models that we use in our tests are up to date?” I am often asked this question by application testing teams who find themselves using Shunra VE in their testing lab every few weeks. These people are not responsible for maintaining the models and often don’t have [...]
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29. January 2009