WEB WORKERS

Early web applications weren't convenient – even trivial changes meant reloading the page, which could take a couple of seconds until the server returned the data. It was almost impossible to work at normal speeds, and there were limitations to the complexity of the applications. About two years ago, AJAX was introduced to speed up online applications. Part of the application logic is implemented in JavaScript and runs in the browser. AJAX doesn't need to talk to the server for many functions, which decreases delays. Even if it needs to request data, it does not automatically mean reloading the page, since the connection between the server and the browser is asynchronous.