Fix Guide

How to Reduce a Large Page Size

Shrink heavy pages so they load fast on mobile data. Most pages should stay under ~1.5MB.

Medium High Impact 30 min

Why It Matters

Every byte costs time on mobile networks. Images are almost always the biggest offender, followed by unminified JavaScript and CSS. A lighter page loads faster, ranks better, and costs your visitors less data.

How to Fix

Compress and convert images

Images are usually 60-70% of page weight. Convert to WebP/AVIF and compress — this alone often halves the page.

Minify and split code

Minify CSS/JS and code-split so each page only ships the JavaScript it actually uses.

Lazy-load below the fold

Add loading="lazy" to off-screen images and iframes so they don't block the initial load.

Code Fix

html

Before (broken)

<!-- 3.4MB page: full-res JPEGs + one big bundle.js -->

After (fixed)

<img src="photo.webp" loading="lazy" width="800" height="600" alt="...">
<!-- code-split, minified bundles; total ~900KB -->

Platform-Specific Instructions

WordPress

Use an image-optimization plugin (ShortPixel, Imagify) for bulk WebP conversion, and a caching plugin to minify CSS/JS.

Next.js

next/image handles format + sizing; the bundler code-splits per route automatically.

Check with our tool

Image Compressor

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How to Reduce a Large Page Size — Fix Guide | SlapMyWeb