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HTTP cookies are used for authentication, personalization, and other purposes. To work around this problem, make sure that static components are requested with cookie-free requests by creating a subdomain and hosting them there. These cookies result in unnecessary network traffic. When the browser requests a static image and sends cookies with the request, the server ignores the cookies. Not all devices support all types of components (such as Flash). Some sites have helpful 404 messages (for example, "Did you mean.?"), which may assist the user, but server resources are still wasted. Making an HTTP request and receiving a 404 (Not Found) error is expensive and degrades the user experience. Optimizing AJAX responses is important to improve performance, and making the responses cacheable is the best way to optimize them. However, using AJAX doesn't guarantee that the user will wait for the asynchronous JavaScript and XML responses to return. One of AJAX's benefits is that it provides instantaneous feedback to the user by requesting information asynchronously from the back-end web server. Duplicate scripts also waste mobile bandwidth. Remove duplicate JavaScript and CSSĮvaluating redundant scripts wastes time-and the duplicate parsing happens even if the script is cacheable. This behavior could corrupt user data, waste server computing cycles generating a page that will never be viewed, and in the worst case, cripple your servers by sending a large amount of unexpected traffic. Safari will make a request to the actual page itself. However, this isn't the case in most browsers.
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You may expect a browser to do nothing when it encounters an empty image SRC tag. Redirects can cause significant delays for mobile user web access. Reducing the number of unique objects on the page will help reduce sensitivity to latency. Latency has a substantial impact on mobile application performance. Near-future headers expiration dates prevent effective caching and cause a repeat visit to your site from the device to be slower than necessary. Once you understand the value of performance engineering and why you need it, and once you know what the key performance engineering metrics are, the 23 performance engineering best practices below will help you optimize the user experience and get the best business results. Like most things in life, web applications have rules you should follow, and this is especially true as you move from a performance testing to a performance engineering mindset.