In today’s fast-paced digital world, speed matters. Whether you’re running an e-commerce store, a streaming platform, or a media publication, the time it takes for your pages to load can make or break user engagement and conversions. Enter Early Hints—a powerful performance optimization technique designed to shave off critical milliseconds from your load times, enhancing both user experience and SEO rankings.
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What Are Early Hints?

At its core, Early Hints is a mechanism that allows a web server to communicate with a browser about key resources that will be needed before the full page is even processed. This proactive approach significantly improves what is known as the perceived render time—the time it takes for a user to feel like a page has loaded.

Normally, when a browser requests a webpage, it has to wait for the HTML to be fully received before discovering the additional resources such as images, JavaScript, CSS files, and fonts it needs to load. Early Hints accelerates this process by sending a 103 Early Hints response code along with preload and preconnect instructions, effectively warming up connections and retrieving key resources in parallel while the page is still being assembled in the background.

An example of this might be the primary product image on an e-commerce product page with an instruction to fetch a specific image from the CDN. 

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Why Should Businesses Care?

Early Hints isn’t just about shaving milliseconds off load times, it directly impacts business outcomes in two significant ways:

Enhanced User Experience & Conversion Rates

Speed is crucial in driving engagement. Research shows that even a 100-millisecond delay in load time can decrease conversion rates by up to 7%. Whether it’s a retail site encouraging users to add items to a cart, a streaming platform loading reviews, or a media website driving readership, faster load times correlate with higher interaction rates.

Improved SEO Performance

Google has made it clear: site speed influences search rankings. Specifically, Core Web Vitals play a role in determining how a site ranks. One of the most critical Core Web Vitals is Largest Contentful Paint (LCP), which measures how quickly the largest visible content on a page (often a hero image or product image) fully renders. Early Hints directly optimizes for LCP by instructing the browser to retrieve and display these crucial assets sooner.

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How Early Hints Work

Traditional web page loading operates sequentially:

1. A browser requests a webpage from a server.
2. The server processes the request and returns the full page.
3. The browser parses the page and starts requesting additional resources.

This approach leads to significant wait times, especially if the page involves complex queries or backend processing.

With Early Hints, the process is optimized:

1. The browser requests a webpage.
2. The server immediately responds with a 103 Early Hints containing preload and preconnect instructions.
3. While the full page is still being processed, the browser starts warming up connections and loading key resources in parallel.
4. Once the final page response arrives, many of the needed resources are already loaded, significantly reducing perceived load times.

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Implementation: How to Identify Critical Resources

Implementing Early Hints effectively requires a strategic approach to identifying which assets are most crucial for perceived speed. The Largest Contentful Paint (LCP) element is a prime candidate. Other cacheable assets like fonts, CSS, and JavaScript files can also be preloaded to accelerate rendering.

Identifying these assets can be done through:

• Real User Monitoring (RUM) tools that track which resources are blocking rendering.
• Web performance audits using tools like Lighthouse and WebPageTest.
• Developer analysis to determine the most important assets per page.

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Why Harper is the Right Partner for Early Hints

Harper is uniquely positioned to enable Early Hints by offering both the distributed data storage and logic layers necessary to manage these optimizations. Many web servers and third-party content providers don’t natively support 103 Early Hints, requiring an intermediary to process and deliver these instructions efficiently.

With Harper:

• Early Hints can be dynamically stored and retrieved via our database, cache, and API layers.
• Responses are delivered from globally distributed nodes, reducing latency and ensuring that hints reach the browser as quickly as possible.
• Developers can automate the identification of critical resources rather than manually updating hints whenever site content changes.

By integrating Early Hints with Harper, businesses can eliminate origin wait times, accelerate page rendering, and deliver fast experiences to users worldwide.

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Getting Started with Early Hints

For businesses exploring Early Hints, the key steps are:

1. Define Performance Goals – Establish an LCP target and measure current site speed.
2. Assess Technical Feasibility – Determine whether your existing tech stack supports or is appropriate for Early Hints or if a proxy solution like Harper is needed.
3. Identify Critical Resources – Use performance monitoring tools to determine which assets should be preloaded.
4. Implement & Test – Deploy Early Hints and measure improvements using Core Web Vitals and other performance benchmarks.
5. Optimize Over Time – Continuously refine your approach as site content evolves.

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Final Thoughts: A Revenue-Generating Optimization

At the end of the day, Early Hints are not just a technical enhancement—they’re a revenue-generating strategy. Faster pages drive more engagement, increase conversions, and improve search rankings, all of which directly impact the bottom line.

Companies looking to optimize their web performance should seriously consider Early Hints as a high-impact, low-effort solution. And with Harper’s technology and expertise, implementing it has never been easier.

Want to supercharge your website’s performance with Early Hints? Reach out to Harper today to build a faster future together.

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