The performance of a website is a key element of its success and often regulate the business of the company that has launched, a prompt response to requests of surfers is definitely a good way to capture customers. The designers often assume that with ' advent of broadband all the elements of a page can be downloaded without distinction without problems, but the practice shows that things are a bit 'different.

Are aware of companies such as Shopzilla, already in 2008 had done so in a heavy, how fruitful investment to change their own web platform, achieving performance interesting, for example, the average download time of pages has increased from 6-9 seconds to 1.2 seconds.

In conceiving and designing a site is required to make the so-called pleasant user experience, also speaking on the performance perceived by the user. In this regard it is appropriate to open a parenthesis on the progressive rendering, which has a positive psychological effect in this direction, for example, the websites linked to a database may begin to appear even before the data are returned for any query. It 'obvious that in this context, each browser has its own rules of behavior.

Every web page is the result of the combination of various objects, which constitute the backbone, from images to JavaScript; first good performance can be achieved with the right trade-off between the resources that you want to offer, and their size. And do not forget that the speed with which you perceive the download of a page depends on the delay caused by the server. However there are several sources on the Web, analyzing the technical elements, which can affect the performance of a site and to be taken into account in its design.

In general, to address the myriad problems that can be interposed between the design of a site and full satisfaction, is crucial to organize a system for automated monitoring of performance. This control must be continuous, not taking for granted that good performance at onset may be constantly maintained. A first step may be the analysis of time taken to download individual items, in which case the offer of the most appropriate tool depends only on your personal preferences.

Then you may proceed with more professional tools that can provide detailed analysis of the behavior of the browser, by measuring the time of execution of JavaScript, rendering, etc.. ( HttpWatch , Firebug , dynaTrace , Load Tester , ecc.). (HttpWatch, Firebug, Dynatrac, Load Tester, etc.)..The results obtained after a precise analysis must then be adapted to the context in which the tests were performed.