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Progressive Hydration: Optimized Interactivity
Hamza Miloud Amar
June 26, 2024
5 min read
Welcome back! In our previous post, we discussed Incremental Site Generation. Today, we'll explore Progressive Hydration, an advanced technique that optimizes the process of making a server-rendered page interactive. Instead of hydrating the entire page at once, Progressive Hydration gradually hydrates portions of the page as needed, enhancing performance and user experience.
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Imagine an artist creating a massive mural. Instead of painting it all at once, it's time consuming process that would make viewers wait, they strategically begin with the sections that will immediately catch the viewer's eye. As people walk along the mural, the artist progressively adds more color and detail, guiding the viewer's gaze and unfolding the artwork's story piece by piece.
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Progressive hydration works similarly: initially, only the visible parts of the web page are fully painted (hydrated). As the user scrolls or interacts with the page, additional sections are progressively hydrated, ensuring a seamless and efficient experience.
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Exactly! Once I receive the HTML, I immediately display it to the user. However, this initial version is not interactive. I prioritize making the essential parts of the page interactive first and then handle the rest as the user interacts with them.
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For example, on an e-commerce product details page, we prioritize making the most essential elements interactive as soon as possible. This includes things like image carousels and the "Buy" button. The reviews section, typically located further down the page, is made interactive only when you scroll to it. This strategy improves the Time to Interactive (TTI) metric, leading to a faster and smoother user experience.
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User Experience: Interactivity is added progressively, improving the Time to Interactive metric 🎨
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SEO: Like SSG, the static content is easily crawlable by search engines, improving SEO. 📈
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Flexibility: Allows developers to prioritize which parts of the page should become interactive . 🔄
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Limitations: Not suitable for highly dynamic apps where all elements need to be interactive are in the viewport, such as chat applications.
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Complexity: Implementing Progressive Hydration can be more complex compared to traditional Hydration. It requires careful planning of when and how to hydrate parts of the page. 🧩
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JavaScript Management: Ensuring efficient loading and execution of JavaScript can be challenging. Overloading the page with too much JavaScript can negate the performance benefits. 🚧
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Duplicate Execution: The same app logic might need to run twice – first on the server to generate the initial HTML, and then again in the browser during hydration to add interactivity.
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Here are some steps to get you started:
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1. Choose a Framework: Use frameworks that support Progressive Hydration, like Next.js or Gatsby. 🛠️
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2. Identify Critical Parts: Determine which parts of your page need to be interactive immediately and which can wait. 🎯
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3. Load JavaScript Progressively: Ensure that your JavaScript is loaded in chunks, prioritizing critical parts first. 🗂️
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We hope you found our discussion on Progressive Hydration insightful. Join us next time as we dive into Streaming Server-Side Rendering, a technique that delivers content to users more efficiently by streaming the HTML from the server. Goodbye for now, and see you in our next post on Streaming Server-Side Rendering!
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