[{"data":1,"prerenderedAt":348},["ShallowReactive",2],{"J8W0x9cJF5":3},[4],{"id":5,"date":6,"date_gmt":7,"guid":8,"modified":10,"modified_gmt":11,"slug":12,"status":13,"type":14,"link":15,"title":16,"content":18,"excerpt":21,"author":23,"featured_media":24,"comment_status":25,"ping_status":25,"sticky":20,"template":26,"format":27,"meta":28,"categories":30,"tags":32,"class_list":33,"acf":41,"yoast_head":42,"yoast_head_json":43,"featured_media_src_url":137,"_links":138,"_embedded":185},1739,"2025-08-10T17:34:08","2025-08-10T14:34:08",{"rendered":9},"https://api.aoskin.ru/?p=1739","2025-09-13T17:45:21","2025-09-13T14:45:21","web-workers-api-how-to-unload-and-speed-up-the-web","publish","post","https://api.aoskin.ru/en/web-workers-api-how-to-unload-and-speed-up-the-web/",{"rendered":17},"Web Workers API: How to Unload and Speed ​​Up the Web",{"rendered":19,"protected":20},"\n\u003Cp class=\"wp-block-paragraph\">The browser has one main thread, and if you load it with calculations, the interface will start to “slow down”.\u003C/p>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">This is where \u003Cstrong>Web Workers API\u003C/strong> comes to the rescue – a mechanism that allows you to execute code in separate threads without blocking the UI.\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">A little bit about Main Thread\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">When a website opens, almost everything in it works inside the main thread. The problem is that there is \u003Cstrong>only one main thread\u003C/strong>.\u003C/p>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">It performs:\u003C/p>\n\n\n\n\u003Cul class=\"wp-block-list\">\n\u003Cli>DOM and CSS rendering,\u003C/li>\n\n\n\n\u003Cli>working with JavaScript,\u003C/li>\n\n\n\n\u003Cli>event handling (clicks, scrolling, text input),\u003C/li>\n\n\n\n\u003Cli>animation rendering.\u003C/li>\n\u003C/ul>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">If you load it with heavy calculations – for example, sorting an array of a million elements or compressing a large image – the interface will “freeze”: buttons will stop responding, animations will twitch.\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Web Worker\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">A Web Worker is a script that runs in parallel with the main page code. It does not have direct access to the DOM, but can:\u003C/p>\n\n\n\n\u003Cul class=\"wp-block-list\">\n\u003Cli>perform heavy calculations,\u003C/li>\n\n\n\n\u003Cli>process large data arrays,\u003C/li>\n\n\n\n\u003Cli>work with network requests,\u003C/li>\n\n\n\n\u003Cli>pass results back to the main thread via messages.\u003C/li>\n\u003C/ul>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Thus, the tasks are divided: \u003Cstrong>the main thread is responsible for the interface, and the worker is responsible for heavy calculations\u003C/strong>.\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">postMessage()\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">The interaction between the page and the worker occurs using the \u003Cstrong>\u003Ccode>postMessage(\u003C/code>\u003C/strong>) method. The \u003Ccode>postMessage()\u003C/code> method is used for secure cross-domain data transfer between different contexts – windows, \u003Ca href=\"https://aoskin.ru/en/blog/iframe-youtube-and-rutube-management-events-and-previews\">frames\u003C/a> or web workers.\u003C/p>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">General form of the call:\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>otherWindow.postMessage(message, targetOrigin, [transfer]);\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cul class=\"wp-block-list\">\n\u003Cli>\u003Cstrong>\u003Ccode>otherWindow\u003C/code>\u003C/strong> – the object to communicate with: this can be a window opened via window.open, a frame (iframe.contentWindow), or a Worker instance.\u003C/li>\n\n\n\n\u003Cli>\u003Cstrong>\u003Ccode>message\u003C/code>\u003C/strong> – the information to be transferred. The data is automatically serialized and deserialized, so a copy is always transferred, not a reference to the object.\u003C/li>\n\n\n\n\u003Cli>\u003Cstrong>\u003Ccode>targetOrigin\u003C/code>\u003C/strong> – the recipient’s address. Instead of a specific domain, you can put “*”, which will allow any source to receive the message, but for security reasons it is preferable to specify the exact origin.\u003C/li>\n\n\n\n\u003Cli>\u003Cstrong>\u003Ccode>transfer (optional)\u003C/code>\u003C/strong> – a list of \u003Cstrong>Transferable objects\u003C/strong> that are only available to one context at a time. For example, an ArrayBuffer can be completely transferred to another context, in which case it becomes unavailable in the original one.\u003C/li>\n\u003C/ul>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Example of a worker\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">worker.js\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\">\u003Ccode>self.onmessage = function (event) {\n  const num = event.data;\n  let result = 0;\n\n  for (let i = 0; i <= num; i++) {\n    result += i;\n  }\n\n  self.postMessage(result);\n};\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">main.js\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-plain\">\u003Ccode>const worker = new Worker("worker.js");\n\nworker.onmessage = function (event) {\n  console.log("Результат:", event.data);\n};\n\nworker.postMessage(1_000_000_000);\n\nconsole.log("UI didn't freeze! Let's continue working...");\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Even if the calculation takes seconds, the interface remains responsive.\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">When to Use Web Workers\u003C/h2>\n\n\n\n\u003Cul class=\"wp-block-list\">\n\u003Cli>Handling large JSON files.\u003C/li>\n\n\n\n\u003Cli>Compressing images before uploading.\u003C/li>\n\n\n\n\u003Cli>Complex mathematical calculations (e.g. graphics, cryptography).\u003C/li>\n\n\n\n\u003Cli>Rendering maps or 3D scenes.\u003C/li>\n\u003C/ul>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Limitations of Web Workers\u003C/h2>\n\n\n\n\u003Cul class=\"wp-block-list\">\n\u003Cli>No direct access to DOM.\u003C/li>\n\n\n\n\u003Cli>Limited in API (e.g. alert, document, window are not available).\u003C/li>\n\n\n\n\u003Cli>Communication only via \u003Ccode>postMessage\u003C/code> / \u003Ccode>onmessage\u003C/code>.\u003C/li>\n\u003C/ul>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">Conclusion\u003C/h2>\n\n\n\n\u003Cp class=\"wp-block-paragraph\">Web Workers are a great tool if you need to make the interface fast and responsive when working with heavy tasks. It is not needed in every project, but if you have freezes, long calculations or heavy data processing, it is time to move it to a separate thread.\u003C/p>\n",false,{"rendered":22,"protected":20},"\u003Cp>Web applications are becoming increasingly “heavy”: complex animations, processing large amounts of data, working with images and video.\u003C/p>\n",1,1737,"open","","standard",{"_acf_changed":20,"_yoast_wpseo_focuskw":26,"_yoast_wpseo_title":26,"_yoast_wpseo_metadesc":29,"footnotes":26},"%%sep%% The Web Workers API will help us with this - a mechanism that allows you to execute code in separate threads without blocking the UI.",[31],64,[],[34,14,35,36,37,38,39,40],"post-1739","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-webapi-en",[],"\u003C!-- This site is optimized with the Yoast SEO plugin v28.8 - https://yoast.com/product/yoast-seo-wordpress/ -->\n\u003Ctitle>Web Workers API: How to Unload and Speed ​​Up the Web\u003C/title>\n\u003Cmeta name=\"description\" content=\"- The Web Workers API will help us with this - a mechanism that allows you to execute code in separate threads without blocking the UI.\" class=\"yoast-seo-meta-tag\" />\n\u003Cmeta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" />\n\u003Clink rel=\"canonical\" href=\"https://api.aoskin.ru/en/web-workers-api-how-to-unload-and-speed-up-the-web/\" class=\"yoast-seo-meta-tag\" />\n\u003Cmeta property=\"og:locale\" content=\"en_US\" class=\"yoast-seo-meta-tag\" />\n\u003Cmeta property=\"og:type\" content=\"article\" class=\"yoast-seo-meta-tag\" />\n\u003Cmeta property=\"og:title\" content=\"Web Workers API: How to Unload and Speed ​​Up the Web\" class=\"yoast-seo-meta-tag\" />\n\u003Cmeta property=\"og:description\" content=\"- The Web Workers API will help us with this - a mechanism that allows you to execute code in separate threads without blocking the UI.\" class=\"yoast-seo-meta-tag\" 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