Why Your Website Is Slow on Phones (and What to Fix First)
Most slow small-business websites have the same few problems. Measure first, then fix them in this order.
1. Measure it, for free
Open PageSpeed Insights (pagespeed.web.dev), paste your homepage address and look at the Mobile tab. Write down the score so you can compare before and after.
Google's three Core Web Vitals tell you what visitors feel:
| Measure | What it means | Good |
|---|---|---|
| LCP | How long the main content takes to appear | 2.5 seconds or less |
| INP | How quickly the page reacts when you tap | 200 milliseconds or less |
| CLS | How much the page jumps around while loading | 0.1 or less |
These come from real visitors. Newer or smaller sites may show "no data"; use the Performance score and its suggestions instead. The score changes a little on every run, so test 2 or 3 times and compare the middle result.
2. Fix the images first
Oversized photos are one of the most common causes. A photo straight from a phone can be several megabytes. Resize images to the size they're actually shown, save them as WebP, and let images further down the page load only when needed (lazy loading).
3. Remove what you don't use
Every plugin, app, widget and tracking script adds weight. Remove the ones you don't need. On Shopify, some apps leave code in your theme even after you uninstall them, so check the theme too.
4. Turn on caching and a CDN
Caching saves a ready-made copy of each page so it doesn't have to be built for every visitor. A CDN serves your files from servers close to each visitor. Many hosts include both; on WordPress a caching plugin usually handles it.
5. Check the basics
- Use no more than two web fonts.
- Avoid sliders and autoplay videos at the top of the page.
- Keep WordPress, your theme and plugins updated.
- On WordPress, if the score is still low, slow or cheap hosting may be the bottleneck.
After each change, measure again on the Mobile tab. Fix one thing at a time so you know what helped.
General information only, not legal or financial advice. Every company and card issuer has its own rules.
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