Such technology is used to improve website speed: To speed up dynamic website data caching mechanism must be equipped with some kind of destructor that would delete cache data when website has been changed; otherwise it would prevent latest information from being displayed. Such mechanism adds expiry date to cache file; cache is recalculated if sever date surpass cache date.
While there are other indicators of how web site performs (SEO, ROI) here we will talk specifically about analyzing web site speed, most important parts of the website, which can hog you down and especially about large web applications, which are designed to be scaled continuously in the future. While this article concentrates specifically on web sites, provided rules can be used to analyze any kind of project.
Web based applications and custom database management software.