Page speed and performance aren’t just technical issues anymore—they directly affect your user experience, SEO rankings, and ultimately your sales. In the world of Core Web Vitals, three metrics stand out for every e-commerce website: LCP (Largest Contentful Paint), FID (First Input Delay), and INP (Interaction to Next Paint).
These terms might sound technical, but they have real business consequences.
At Tech Wishes, a trusted web development company, we have helped e-commerce brands optimize their Core Web Vitals and saw improvements not just in rankings but in conversion rates, bounce rates, and customer engagement. If you’re running an online store, this blog is your guide to understanding and improving LCP, FID, and INP—so your shoppers stay longer, browse more, and convert faster.
What Are LCP, FID, and INP?
Before we dive into solutions, here’s what these metrics mean:
- LCP (Largest Contentful Paint) measures how long it takes the main content of a page to load.
Ideal score: under 2.5 seconds. - FID (First Input Delay) measures how quickly a page reacts when a user interacts (clicks, taps, scrolls).
Ideal score: less than 100 milliseconds. - INP (Interaction to Next Paint) is Google’s newer metric replacing FID. It measures overall responsiveness to all interactions, not just the first one.
Ideal score: below 200 milliseconds.
Trivia: Google considers these metrics as part of its ranking algorithm. If your website scores poorly on these, your SEO may be taking a hit, even if your content is great.
Why Should E-Commerce Businesses Care?
Speed = Sales. According to Google, when page load time goes from 1 second to 5 seconds, the probability of bounce increases by 90%. And in e-commerce, 1 second delay can reduce conversions by up to 20%.
Slow-loading product pages, laggy interaction, or layout shifts are the fastest way to lose potential buyers.
As an ecommerce website development specialist, Tech Wishes regularly audits performance for clients using these Core Web Vitals, and we’ve consistently seen major business impact from small improvements.
Also Read: Speed Up Your Website With These 8 Design Techniques
How to Improve LCP, FID, and INP?
Let’s break it down into actionable steps.
1. Optimize Server Response Times
The slower your server, the slower your LCP. Switch to a faster hosting solution, use a Content Delivery Network (CDN), and set up caching for repeat visitors.
Pro tip: Migrating from shared hosting to a dedicated or cloud server like AWS or Cloudflare can reduce TTFB (Time to First Byte) by over 30%.
2. Compress and Lazy-Load Images
Images are often the largest elements on product pages. Use tools like WebP format, image compression, and lazy loading to ensure they don’t block rendering.
Result: You’ll cut LCP down significantly, especially on image-heavy PDPs (product detail pages).
3. Minimize JavaScript Execution
JavaScript blocks the browser from rendering the page quickly.
Break scripts into smaller parts, defer non-essential JS, and remove unused scripts altogether.
This not only improves LCP but also dramatically helps reduce FID and INP delays.
4. Preload Key Fonts and Assets
Fonts often delay LCP because they load late. Use font-display: swap and preload important assets so they render instantly when the page loads.
Did you know? A font can block the rendering of visible content if not optimized—known as “FOIT” (Flash of Invisible Text).
5. Reduce Third-Party Scripts
Third-party tools (like chat widgets, analytics, or embedded social media) add a lot of JavaScript that slows down FID and INP. Audit all external scripts and keep only the essential ones.
Example: We helped a fashion brand reduce its INP by 42% just by removing a redundant Instagram feed widget.
6. Prioritize Critical CSS
Inline only the critical CSS needed for above-the-fold content. Load the rest asynchronously.
This helps the main content paint faster, improving LCP without affecting styling.
7. Implement Smooth Transitions
Poor animations or layout shifts hurt INP. Use CSS transform and opacity instead of layout-altering properties like top, left, or width.
According to Google’s Web dev team, users perceive websites using CSS transitions as faster, even when they’re not. That’s the power of perception.
8. Monitor and Iterate
Use tools like PageSpeed Insights, Lighthouse, or WebPageTest to track your LCP, FID, and INP scores regularly.
Need help? Our expert website developers at Tech Wishes use real-time diagnostics and performance analytics to fine-tune every aspect of your online store.
Real Impact: A Case Study
A client running a Shopify store approached us with sluggish site performance. Their Core Web Vitals looked like this:
- LCP: 4.1s
- FID: 180ms
- INP: 380ms
After a full performance overhaul by our team, their scores improved to:
- LCP: 1.9s
- INP: 110ms
As a result, their organic traffic rose by 26% in 3 months, and the checkout conversion rate jumped from 2.3% to 3.1%.
Why Work with a Professional Website Development Company?
Improving Core Web Vitals is both technical and strategic. It’s not just about fixing a few things—it’s about designing a system that performs consistently at scale.
At Tech Wishes, we’re more than a website development company. We are your performance partners. Whether you run a Shopify store or a custom e-commerce site, we bring years of experience in e-commerce website development that aligns business goals with technical performance.
Our expert website developers implement performance-focused practices from the very first line of code. That means faster websites, higher rankings, better user experience, and more revenue.
Ready to Speed Up Your E-Commerce Store?
Core Web Vitals are not optional anymore. They are essential for SEO, user experience, and conversions.
If you’re looking for the best website development company to help you improve LCP, FID, and I, P—look no further than Tech Wishes. We deliver high-performing websites that don’t just look good but work fast and sell better.
Contact us today to get a free performance audit and discover how we can help your website win on speed, rankings, and revenue.
