How to Make Your Website Load Faster: The 2026 Speed Checklist
Originally published at https://designtocodes.com on August 18, 2026.
How to make your website load faster
To make your website load faster, optimize and correctly size your images, reduce and defer JavaScript, use caching and a CDN, load fonts efficiently, and set image dimensions to stop layout shift. Most slow sites fail on the same few things. This framework-agnostic checklist fixes them, in order of impact.
The 2026 website speed checklist
| Problem | Fix | Improves |
|---|---|---|
| Large or wrong-format images | WebP/AVIF, sized correctly, lazy-load, preload hero | LCP |
| Too much JavaScript | Audit third-party scripts, defer non-critical, code-split | INP |
| Blocking or swapping fonts | Self-host, font-display: swap, preload | LCP + CLS |
| No caching or distant server | Cache headers, a CDN, compression | TTFB |
| Images with no dimensions | Set width and height or aspect-ratio | CLS |
How to measure
Run your page through PageSpeed Insights and read the mobile field data, not just the lab score. Aim for Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1.
Start with images (the usual culprit)
- Serve WebP or AVIF instead of PNG or JPEG.
- Size images to their display size — never a 3000px image in a 400px slot.
- Lazy-load everything below the fold.
- Preload the hero image; it is almost always your LCP element.
Then reduce JavaScript
- Audit third-party scripts — chat, analytics, and ad tags are often the heaviest thing on the page.
- Defer non-critical scripts so they do not block rendering.
- Code-split heavy features so they load only when needed.
Frequently asked questions
What is the biggest thing that slows a website down?
Usually images — large, unoptimized, wrongly-sized files. Serving modern formats at the right size and lazy-loading is the highest-impact fix on most sites.
Does website speed affect SEO?
Yes. Core Web Vitals are a Google ranking signal, and fast, server-rendered pages are easier for AI engines to read and cite. Speed helps both search and AI visibility.
How fast should a website load?
Aim for Largest Contentful Paint under 2.5 seconds on mobile, INP under 200 milliseconds, and CLS under 0.1 — the Core Web Vitals "good" thresholds.
My site is still slow after all this. Why?
The template itself may be the weight. Page-builder and multipurpose themes ship code you cannot optimize away; starting from a lean, hand-coded template is sometimes the real fix.
Starting from a slow template? Browse lean, fast DesignToCodes templates built to pass Core Web Vitals.
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