lazy loading

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      Lazy loading (also known as asynchronous loading) is a technique used in computer programming, especially web design and web development, to defer initialization of an object until it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used. This makes it ideal in use cases where network content is accessed and initialization times are to be kept at a minimum, such as in the case of web pages. For example, deferring loading of images on a web page until they are needed for viewing can make the initial display of the web page faster. The opposite of lazy loading is eager loading.


      Examples




      = With web frameworks

      =
      Prior to being established as a web standard, web frameworks were generally used to implement lazy loading.
      One of these is Angular. Since lazy loading decreases bandwidth and subsequently server resources, it is a strong contender to implement in a website, especially in order to improve user retention by having less delay when loading the page, which may also improve search engine optimization (SEO).
      Below is an example of lazy loading being used in Angular, programmed in TypeScript from Farata Systems


      = As a web standard

      =
      Since 2020, major web browsers have enabled native handling of lazy loading by default.
      This allows lazy loading to be incorporated into a webpage by adding HTML attributes.
      The loading attribute support two values, lazy and eager. Setting the value to lazy will fetch the resource only when it is required (such as when an image scrolls into view when a user scrolls down), while setting it to eager, the default state, the resource will be immediately loaded.


      Methods


      There are four common ways of implementing the lazy load design pattern: lazy initialization; a virtual proxy; a ghost, and a value holder. Each has its own advantages and disadvantages.


      = Lazy initialization

      =

      With lazy initialization, the object is first set to null.
      Whenever the object is requested, the object is checked, and if it is null, the object is then immediately created and returned.
      For example, lazy loading for a widget can be implemented in the C# programming language as such:

      Or alternatively, with the null-coalescing assignment operator ??=

      This method is the simplest to implement, although if null is a legitimate return value, it may be necessary to use a placeholder object to signal that it has not been initialized. If this method is used in a multithreaded application, synchronization must be used to avoid race conditions.


      = Virtual proxy

      =
      A virtual proxy is an object with the same interface as the real object. The first time one of its methods is called it loads the real object and then delegates.


      = Ghost

      =
      A ghost is the object that is to be loaded in a partial state. It may initially only contain the object's identifier, but it loads its own data the first time one of its properties is accessed. For example, consider that a user is about to request content via an online form. At the time of creation, the only information available is that content will be accessed, but the specific action and content is unknown.
      An example in PHP:


      = Value holder

      =
      A value holder is a generic object that handles the lazy loading behavior, and appears in place of the object's data fields:


      See also


      Software design pattern
      Dynamic loading
      Proxy pattern
      Lazy evaluation
      Lazy initialization


      References




      External links


      Lazy Loading, Mozilla Developer Network
      URLs, WHATWG HTML Standard
      JS Lazy Loading

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    Lazy loading - Web performance | MDN - MDN Web Docs

    Dec 19, 2024 · Lazy loading is a strategy to identify resources as non-blocking (non-critical) and load these only when needed. It's a way to shorten the length of the critical rendering path, which translates into reduced page load times.

    What is Lazy Loading? - GeeksforGeeks

    Feb 18, 2025 · Lazy loading is a performance optimization technique that defers the loading of non-essential resources until they are required. In JavaScript applications, this technique is commonly used to improve page load speed by delaying the loading of images, videos, and even JavaScript modules.

    Lazy loading - Wikipedia

    Lazy loading (also known as asynchronous loading) is a technique used in computer programming, especially web design and web development, to defer initialization of an object until it is needed. It can contribute to efficiency in the program's operation if …

    Lazy Loading vs. Eager Loading - GeeksforGeeks

    Oct 10, 2024 · Lazy Loading and Eager Loading both are strategies to manage how data is fetched from a database or API in application development in System design. Lazy Loading delays loading related data until it's actually accessed, while Eager Loading retrieves all the necessary data in a single query.

    How Lazy Loading Works in Web Development - freeCodeCamp.org

    Jan 4, 2024 · Using lazy loading, particularly through the loading attribute in HTML, can significantly help you improve web performance. By selectively deferring the loading of images and iframes until they are needed, this technique not only enhances the speed and efficiency of web pages but also contributes to a more seamless and responsive user experience.

    What is lazy loading? - TechTarget

    Lazy loading is a design pattern in web development that only loads necessary code components immediately, deferring nonessential components. This approach aims to improve an application's initial load time and overall performance by only loading the functionality when a user needs it.. Deferring nonessential components also enables the core functionality to load more efficiently.

    What is lazy loading? - Cloudflare

    Lazy loading means waiting to load some parts of a webpage until they are needed. Learn how lazy loading images work and why lazy loading speeds up a webpage.

    What Is Lazy Loading? - Elementor

    Jan 19, 2025 · Lazy loading is about more than just delayed loading; it’s a philosophy of web performance optimization. By serving only the content users need at the precise moment they need it, you can achieve the following:

    Lazy Loading - Next.js

    Lazy loading in Next.js helps improve the initial loading performance of an application by decreasing the amount of JavaScript needed to render a route. It allows you to defer loading of Client Components and imported libraries, and only …

    What is Lazy Loading: A Definition - Wix.com

    What is lazy loading? Lazy loading is a web development optimization technique that delays the loading of non-critical elements on a web page.