Quick answer
Website Speed Optimization Checklist
Website speed optimization should begin with the priority templates and the user journeys that matter commercially. The practical work is controlling hero media, JavaScript, layout stability, font loading, caching, third-party scripts, and what is measured after launch.
Start with field data and page jobs
Website speed optimization should start with the pages that matter most: homepage, service pages, pricing routes, checkout or enquiry flows, high-traffic articles, and templates that appear in Search Console or analytics.
Lab tests are useful for diagnosis, but field data shows what visitors experience across devices, networks, and sessions. The practical goal is to connect performance detail to the page job instead of tuning one score in isolation.
- Identify priority templates and their commercial or search job
- Review Search Console, PageSpeed Insights, analytics, server logs, and browser traces where available
- Separate field issues from lab-only warnings
- Check mobile and desktop separately
- Record which fixes belong to content, design, frontend, hosting, or third-party tools
Share the slowest priority templates and we will identify the first speed, Core Web Vitals, and layout-stability risks to fix.
Get a 3-point project reviewCore Web Vitals checks
Core Web Vitals focus on loading, interactivity, and visual stability. The current metrics are Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift.
A practical checklist should treat the good targets as page-experience thresholds: LCP at 2.5 seconds or less, INP at 200 milliseconds or less, and CLS at 0.1 or less at the 75th percentile. Passing a lab run does not prove every visitor gets that experience.
- LCP: hero image, heading, server response, render blocking resources, and priority loading
- INP: JavaScript size, hydration cost, third-party scripts, long tasks, and interaction handlers
- CLS: image dimensions, font loading, embedded content, banners, dynamic sections, and reserved space
- Route groups: compare homepage, service pages, articles, forms, and ecommerce routes separately
- Regression checks: keep performance visible when content, media, scripts, or layout modules change
Assets, code, and layout fixes
Most speed fixes are not exotic. They come from giving the browser less unnecessary work, reserving stable layout space, shipping the right media, and removing scripts that do not support the buyer journey.
Performance work is strongest when designers, content owners, and developers share the same budget. A visually impressive page can still be lean if image crops, animation, font choices, and script decisions are made before build.
- Serve correctly sized images in modern formats with plain priority decisions
- Use stable dimensions for media, cards, embeds, forms, and repeated sections
- Keep fonts limited, self-hosted where appropriate, and loaded without layout surprises
- Reduce client-side JavaScript on pages that can be server-rendered
- Audit analytics, chat, embeds, personalization, and other third-party scripts
- Use caching, CDN behaviour, compression, and deployment settings deliberately
What a speed checklist should not hide
A fast website still needs plain content, usable forms, accessible controls, useful supporting detail, and a sensible conversion path. Performance should support the buyer journey, not replace it.
Speed optimization also needs maintenance. New images, scripts, embeds, landing pages, and design modules can reintroduce old problems unless performance checks are part of the launch and content process.
Website speed optimization checklist
- Field data: Search Console, PageSpeed Insights, analytics, logs, and priority route groups.
- LCP: hero media, server response, render blocking resources, image priority, and font loading.
- INP: JavaScript weight, hydration cost, long tasks, interaction handlers, and third-party scripts.
- CLS: image dimensions, embeds, banners, dynamic sections, font swaps, and reserved layout space.
- Delivery: caching, CDN behaviour, compression, deployment settings, monitoring, and regression checks.
Common mistakes to avoid
- Optimizing a Lighthouse score while ignoring field data and priority page jobs.
- Compressing images after approving heavy templates instead of setting media budgets before build.
- Adding scripts, embeds, or animations without a performance budget and retest plan.
What 760 Studios would review first
- Priority templates and Core Web Vitals risk
- Hero media, JavaScript, and layout stability
- What to measure before and after optimization
Questions this article answers
Which speed issues should be checked first?
Check LCP hero media, server response, render-blocking assets, JavaScript weight, interaction delay, layout shifts, font loading, embeds, analytics scripts, and whether mobile pages feel stable.
Is a Lighthouse score enough to judge website speed?
No. Lighthouse is useful, but field data, page priority, conversion routes, device mix, and actual user experience should guide which fixes matter most.
How can design decisions slow a website down?
Oversized hero images, unreserved media dimensions, heavy animation, late-loading fonts, dense client-side components, and third-party scripts can all make a high-end design feel slower.
What should be retested after speed work?
Retest priority URLs, Core Web Vitals, important forms, navigation, visual stability, image execution detail, analytics events, and whether any optimization removed useful page content.