Why Does Field Data for Site Speed Differ from Lab Tests?
A 100 PageSpeed score while users complain? Read the field data (CrUX). Learn the difference between lab and field data, how to measure, and how to fix common issues here.
Read more
Blog & Learn
Posts tagged #Core Web Vitals
Practical articles on hosting, servers, security, SEO and online business — in plain, useful language.
What Is TTFB and Why Does Your Website Seem Slow?
High TTFB means users are waiting, even if the server is fast. In this article, you'll learn how to separate network, server, and browser time and figure out where you actually need to optimize.
Read moreEliminating Render-Blocking Resources: A Practical Guide for Persian Websites
Render-blocking CSS and JavaScript eat away at your website's speed. In this article, you'll learn how to implement critical CSS, use defer and async correctly, and understand when preload is a solution and when it's a problem.
Read moreLazy Loading: A Practical Guide That Won't Ruin Your Site's LCP
Proper lazy loading can multiply your site's speed; but if you lazy-load the above-the-fold image, LCP gets devastated. Here we'll tell you exactly where to use it, where not to, and how to implement it correctly.
Read moreFixing CLS Layout Shift on Persian Websites; From Font to Image
Layout shift (CLS) ruins the SEO ranking and user experience of Persian websites. In this guide, we examine the three main sources of shift — font, ad, and image — with precise commands and code.
Read moreImproving LCP: Finding the Culprit Element and Fixing Slow Loading
A step-by-step guide to finding the LCP element in DevTools, four common causes of its slowness, and the correct order of fixes to improve LCP and user experience.
Read moreCore Web Vitals: A Practical Guide to LCP, INP, and CLS
Learn Google's Core Web Vitals metrics with precise thresholds, measurement commands, and common mistakes in optimizing LCP, INP, and CLS.
Read moreThe Complete Guide to Website Speed Optimization; From Click to Render
Understand the complete chain of website speed optimization from DNS to browser rendering, and optimize each link in the shortest time with proper prioritization.
Read moreWebsite speed test tools and how to read the results
Learn the difference between lab data and field data in website speed testing, and with real examples, know which metric to fix first. A practical guide to real speed improvement.
Read more