Offloading third-party scripts to web workers running in background threads is a potential solution that allows users to keep their scripts while improving performance. This becomes especially critical for eCommerce sites and online marketplaces that need these third-party scripts to run their business and where time really is money. When you have lots of third-party scripts on your web page, they will block your own JavaScript. Excessive DOM elements or expensive CSS selectors.Use of legacy APIs (e.g document.write()) known to be harmful to the user experience.Blocking content display until they complete processing.Lack of sufficient server compression of resources.Resource-intensive script parsing and execution.Too many network requests to multiple servers.This leads to a negative effect on Lighthouse scores, Core Web Vitals, and search rankings and reduced user engagement.Īccording to Google Web Fundamentals, third-party scripts can cause several issues including: It’s also important to remember that your end user’s mobile devices are way less sophisticated than the ones your website was built on: All the JavaScript on your website is the reason the average web page takes more than 14 seconds to load and get interactive on mobile. Third-party scripts, which are code that is embedded within your site and not directly under your developers’ control, compete with a website’s own code for the browser’s main thread, which delays content rendering and makes websites feel sluggish. Large images and videos aside, third-party scripts like pixel trackers, A/B testing, ads, widgets, CDNs, etc., are usually the biggest pieces of the performance puzzle. Providing rich, interactive website experiences needs added assets that consume your users’ resources, from CPU and GPU to memory and network. It’s a known fact that JavaScript is one of the main culprits behind website bloat. When you need these third-party scripts on your website to run your business, as most websites do, you have a massive challenge on your hands: How can you improve your key performance metrics and keep your users happy without compromising on important capabilities? The JavaScript Tax Large, unwieldy websites, with several third-party scripts embedded, are usually behind a frustrating user experience. But modern web pages are heavy and ever-growing in size (known fondly as “website bloat”): The average web page is over 2 megabytes large with over 200 requests. Performance needs to be built in starting at the code level, and user-centric metrics like time to interactive (TTI), total blocking time (TBT), and first input delay (FID) help you gauge how fast a website is. This is why performance is crucial when building websites. Even if your website is designed with usability in mind, these factors impede users from fully benefiting from the website’s features. And slow websites are, in a way, discrimination: The majority of the world’s population don’t have access to high-speed Internet or fast CPUs. However, it’s not always easy to maintain high performance in websites. The average user doesn’t spend much time waiting for a web page to load or to interact with the page: According to Google, if a page’s load time goes up from 1 second to 3 seconds, the probability of the user bouncing increases by 32%. Great user experience starts with a page that loads instantly. Introducing Partytown, a lightweight open-source solution that reduces execution delays due to third-party JavaScript by offloading third-party scripts to web workers, which run in background threads.
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