Website Speed Upgrades: Fix Crawling Delays and Core Web Vitals

Have you ever noticed that Google seems to be crawling your site slower than you’d like? It’s a frustrating issue, but it often boils down to your server response time. When your server lags, it can signal to Google that your site might not be a priority. Let me share some insights from my own experiences and how I tackled this challenge.

How Crawl Budget Depends on Speed

So, here’s the deal: Google has limited resources for crawling websites. If your site is fast and reliable, it gets a larger slice of the crawl budget. On the flip side, if it’s slow, it gets less love from Google. Even a tiny delay in how quickly your server responds can really affect how many pages Google decides to crawl.

For instance, if your Time to First Byte (TTFB) is over 800ms, Googlebot might slow down the crawl rate. But if you get it under 200ms, Google thinks, “Hey, this site can handle more traffic!” and increases the crawl frequency.

I saw this play out on my own site. Before I optimized my performance, Google crawled around 15-20 pages a day. After cutting my TTFB to under 300ms, that number jumped to 40-60 pages daily. It’s all about making your server faster so that Google naturally prioritizes your site.

Core Web Vitals That Matter for Crawling

Google uses three main Core Web Vitals metrics to assess user experience, and guess what? Each one also plays a role in crawling indirectly.

Largest Contentful Paint (LCP)

LCP is all about when the main content of a page loads. Google aims for this to happen in under 2.5 seconds.

Some common culprits for slow LCP include:

• Hero images that aren’t optimized
• Slow server response times
• Render-blocking CSS or JavaScript
• Font loading delays

If your LCP is consistently over 4 seconds, Google may deprioritize those pages in its crawl queue. So, speeding this up can help Google find your content faster!

First Input Delay (FID) / Interaction to Next Paint (INP)

FID measures how responsive your site is, with Google targeting under 100ms. In 2026, INP will take over FID.

JavaScript-heavy sites can struggle here. If your site is loading a ton of scripts before it’s interactive, users and Googlebot alike will have to wait. Googlebot doesn’t click buttons, but heavy JavaScript can block it from seeing all your content.

Cumulative Layout Shift (CLS)

CLS measures how stable your layout is. Google aims for under 0.1 here.

While shifting layouts don’t directly impact crawling, they can indicate missing dimensions on images or ads, which might confuse Googlebot when rendering your page.

Practical Speed Upgrades That Actually Work

I’ve tried a lot of speed optimization tips, and honestly, some of them were just noise. Here are the strategies that really made a difference for me:

Enable Compression

If your server isn’t using Brotli or Gzip compression, your HTML, CSS, and JavaScript files might be way larger than they need to be - 3-5 times larger, in fact! Enabling compression at the server level is crucial. If you’re using a managed hosting service like Vercel, this is usually taken care of for you. If you’re managing your own server, just double-check that compression is active.

You can test this using your browser’s developer tools. Look for the response headers to see if you’ve got content-encoding: br (Brotli) or gzip. If not, it’s time to fix that before moving on!

Use Modern Image Formats

JPEG and PNG are a bit outdated. Formats like WebP and AVIF can provide the same quality at 25-30% smaller file sizes. I converted all the cover images on my site to WebP, and the average file size dropped from 120KB to 35KB without sacrificing quality.

For images in your content, always specify explicit width and height attributes. This helps prevent layout shifts and improves LCP.

Eliminate Render-Blocking Resources

You might have seen the “Eliminate render-blocking resources” warning in Google’s PageSpeed Insights. These are CSS or JavaScript files that need to load before anything shows up for users.

To fix this, you can inline critical CSS, defer non-critical CSS, and use async or defer attributes on JavaScript files. If you’re using modern frameworks like Astro (which powers this site), it does a lot of this automatically for you.

Set Proper Cache Headers

Cache headers guide browsers and CDNs on how long to keep copies of your files. For example, if your CSS file takes 200ms to download, you don’t want the browser to download it again on the next page load.

You can set Cache-Control: public, max-age=31536000 for static assets like CSS, JavaScript, and images. For HTML pages that change more frequently, use must-revalidate. By fixing my cache headers, I managed to reduce repeat-visit load times by 60%.

Optimize Server Response Time

TTFB is the time from when a browser requests a page to when it receives the first byte of the response. For dynamic sites, this includes database queries, template rendering, and framework boot time.

If your site uses a database, it’s worth checking query performance. A slow query can add a hefty delay to your load times. Look into adding indexes, caching query results, and keeping the number of queries per page to a minimum.

For static sites like this one (built with Astro), TTFB should ideally be under 100ms on a good CDN. If it’s higher, your hosting provider might be the bottleneck.

Checking Your Results

Once you’ve made these changes, it’s a good idea to verify your progress with:

• PageSpeed Insights: This gives you both lab data and real data from Chrome users.
• Search Console Core Web Vitals report: It shows how Google views your site’s performance.
• Chrome DevTools Network tab: This provides a real-time waterfall view of every resource loading on your page.

Remember, it’s not about chasing a perfect score. A 95 on PageSpeed Insights with fast real-user metrics is fantastic. An 85 with the same speedy metrics is also acceptable. The goal is to consistently achieve under 2.5s LCP, under 100ms INP, and under 0.1 CLS.

If you’re looking for more insights on website performance and SEO, check out the Core Web Vitals guide for new websites for detailed metric definitions and diagnostic tools. Also, the website speed optimization guide dives into a broader set of performance improvements.

FAQ

Q: Does site speed actually affect crawling frequency’
A: Yes, a slow site gets crawled less often. Improving response times directly increases crawl frequency.

Q: What is the fastest way to improve LCP’
A: Optimize your largest content element. Serve images in WebP, preload hero images, and eliminate render-blocking resources.

Q: Do CDNs help with Core Web Vitals’
A: They assist with LCP by serving static assets from edge locations. However, they won’t fix server-side issues like slow database queries.

Q: Is a 90+ PageSpeed score necessary’
A: Not really. Real-user metrics are more important than lab scores. A score in the 70s with fast real-user data is just fine.

Q: How does lazy loading affect SEO’
A: Lazy loading can help LCP when implemented correctly. Use native loading=lazy and ensure critical content loads right away.

Related Guides

• Core Web Vitals Fail? Improve LCP, INP, and CLS: A detailed optimization guide for each metric.
• Website Speed Optimization: Why It Matters for SEO: A broader set of performance improvement strategies.
• Technical SEO Checklist for Beginners: All the fundamentals in one handy place.

References & Further Reading

• Google Web Vitals
• Wikipedia: Core Web Vitals