Which Server Configuration Changes Can Help Improve Core Web Vitals Metrics Like FCP and LCP Across Different Web Servers?


To improve Core Web Vitals metrics such as First Contentful Paint (FCP) and Largest Contentful Paint (LCP) across different web servers, consider implementing server optimizations, asset delivery optimizations, and code optimizations. These strategies will facilitate quicker server responses, faster asset delivery, and more efficient website rendering.

Server Optimizations

Utilize Content Delivery Networks (CDN)

A Content Delivery Network (CDN) helps serve static assets quickly from servers located near users, which reduces latency and improves loading times [Why Performance Matters, 2023].

Implement Server-Side Caching

Using server-side caching can deliver pre-rendered pages or components, thereby reducing server lag and improving FCP and LCP metrics [Time to First Byte (TTFB), 2020].

Optimize Database Queries

Database query optimizations and the use of indexing can minimize latency, reducing server response time, and improving server performance [Optimize CSS Delivery, 2022].

Asset Delivery Optimizations

Preload Important Assets

The <link rel="preload"> directive can prioritize loading critical resources, which can improve LCP measurements [Preload Critical Assets, 2022].

Compress and Optimize Resources

Use formats like WebP, Gzip, and Brotli to compress images and text files. This reduces their size and quickens their delivery, enhancing FCP and LCP [Enable Text Compression, 2021].

Use Responsive Images

Implementing responsive images with the <srcset> and <sizes> attributes enables efficient loading of images based on the user's viewport, which can improve LCP [Serve Responsive Images, 2023].

Code Optimizations

Optimize CSS Delivery

Minify CSS, use <link rel="preload"> for critical styles, and defer non-critical styles to minimize blocking rendering, all of which can notably boost FCP and LCP [Optimize CSS Delivery, 2022].

Defer or Asynchronously Load JavaScript

By deferring non-critical JavaScript or loading it asynchronously, server response times can be improved, which in turn enhances FCP and LCP [Defer Non-Critical JavaScript, 2023].

Minimize Critical Rendering Path

Inlining essential styles and scripts can reduce the number of HTTP requests, decreasing the critical rendering path and improving FCP and LCP [Understanding the Critical Rendering Path, 2023].


To enhance Core Web Vitals like FCP and LCP, it's crucial to configure the server to respond quickly, optimize asset delivery, and minimize render-blocking resources. By implementing these strategies, website performance can be significantly improved, leading to better user experience.