Start a website speed review by measuring the pages customers actually use. Identify whether the delay comes from server response, media, rendering or interaction work, then fix and retest that bottleneck. A platform switch or a higher lab score alone does not establish more enquiries.
Which measurements matter?
Google's Core Web Vitals guidance defines good results as LCP at or below 2.5 seconds, INP at or below 200 milliseconds and CLS at or below 0.1. Field assessment uses the 75th percentile of visits. These measure loading, responsiveness and visual stability respectively.
| Measurement | What it helps answer | Important limit |
|---|---|---|
| Field LCP | How quickly visitors see the main content | Depends on actual devices, connections and visits |
| Field INP | How responsive interactions are | A single page-load lab test does not establish field INP |
| Field CLS | Whether content shifts unexpectedly | Check forms, fonts, images and late-loading UI |
| Lab LCP and Total Blocking Time | Where a controlled load may be delayed | TBT is a diagnostic, not a replacement for INP |
| Accepted enquiries and qualified leads | Whether the journey supports the business goal | Segment by page and source; a speed change is not proof of causation |
PageSpeed Insights separates field data from a Lighthouse lab test. If the field section says there is insufficient data, report that limitation. Do not present a lab result as a Core Web Vitals pass for real users.
Which five fixes should you investigate first?
1. Size and prioritise images correctly
Use dimensions appropriate to the layout and suitable compression. Reserve width and height to prevent shifts. Keep the main visible image discoverable in the initial HTML and avoid lazy-loading it. Lazy-load images further down the page. Test the actual image chosen by the browser at mobile widths.
2. Check server response and caching
A slow document response delays everything that follows. Review hosting, database work and cache behaviour before changing providers. Confirm that personalised or sensitive pages are not publicly cached. Test from locations relevant to your customers.
3. Reduce browser rendering and script work
Find long tasks and expensive components in a performance trace. Remove unused dependencies and unnecessary client state. Break up heavy interaction work. Reducing JavaScript can help, but large DOM trees and repeated animations also deserve inspection.
4. Defer nonessential media and third parties
Load decorative video when needed and respect reduced-motion preferences. Audit third-party scripts individually. Keep measurement requirements in the decision: delaying analytics indiscriminately can lose landing or early-click attribution. Retest navigation and forms after changing scheduling.
5. Deliver static assets efficiently
Review compression, cache headers and CDN delivery for images, styles and scripts. A CDN can reduce delivery distance, but it cannot fix a large client bundle or expensive interaction handler. Confirm stale content is refreshed correctly after a release.
Does a faster website rank higher or convert better?
Google uses Core Web Vitals within its ranking systems, but good scores do not guarantee top rankings. There is no universal conversion percentage gained for each second saved. Measure your own organic landing sessions, accepted enquiries and qualified leads over a meaningful period, accounting for changes in traffic and campaigns.
Should you optimise or rebuild?
Start with a measured tune-up when the current site meets the business brief. Consider rebuilding when required workflows or structural problems make maintenance impractical. A Next.js build still needs performance engineering; it does not guarantee 90+ PageSpeed. Our platform comparison explains the tradeoffs.
What should a performance review deliver?
Ask for the tested URLs, date, device and connection settings, field-data availability, identified bottlenecks and before/after results. Include checks for working forms, navigation and analytics. Blu Mint Digital can scope a review through website maintenance or a project enquiry.
Frequently Asked Questions
How can I speed up my website?
Measure representative pages first. Investigate image weight, server response, browser script and rendering work, nonessential media and asset delivery. Prioritise the bottleneck shown by the test and retest the same pages.
What are Core Web Vitals?
Core Web Vitals measure loading, responsiveness and visual stability through LCP, INP and CLS. Good thresholds are LCP at or below 2.5 seconds, INP at or below 200 milliseconds and CLS at or below 0.1, assessed at the 75th percentile of visits.
Does page speed affect SEO?
Google uses Core Web Vitals within its ranking systems. Good results support the page experience, but do not guarantee rankings or replace relevant content.
Why is my website slow?
Possible causes include slow server responses, heavy images, excessive scripts, expensive rendering and third-party services. Use a performance trace to identify the cause on your actual pages.
What's the difference between optimising a website and rebuilding it?
Optimisation fixes measured bottlenecks in the existing site. A rebuild replaces its structure and implementation. Compare the required functionality and maintenance cost before choosing the larger project.
Does a CDN make a website faster?
A CDN can shorten asset delivery distance and improve caching. It does not remove expensive browser work, so test whether delivery is a bottleneck before expecting an improvement.