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Here are two examples of the 115 best practices that can be applied to a web application.
Be sure to check the other ones
Accessing the DOM (Document Object Model) via JavaScript is a heavy process that uses a lot of processor power (CPU). Minimize this type of access as much as possible.
To do so, you can assign a node to variables that you will repeatedly use in the application’s lifecycle, which avoids traversing the tree each time the document is manipulated.
Libraries such as ‘Shadow DOM’ can also be used to optimize the tree though a batch system.
Avoid using plugins (Flash Player, Java and Silverlight virtual machines, etc.) because they can be a heavy drain on resources (CPU and RAM). This is especially true with Adobe’s Flash Player, to such an extent that Apple decided to not install the technology on its mobile devices to maximize battery life. Favor standard technology such as HTML5 and ECMAScript.