Site speed SEO means making pages load, respond and stay stable fast enough that visitors do not leave and Google's Core Web Vitals checks pass. We measure Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift, fix the causes in your templates, and test again with the same tools.
By Abdullah Mahmud Last updated
Core Web Vitals are three measurements Google publishes for real page experience: how quickly the main content appears (Largest Contentful Paint), how quickly the page reacts to input (Interaction to Next Paint) and how much the layout jumps while loading (Cumulative Layout Shift). PageSpeed Insights and Lighthouse report them.
Speed problems rarely come from one big mistake. They add up: a heavy script on every page, images far larger than they display, a late banner that pushes content down. Fixing them in the shared template changes every page that uses it, which is why we work by template and not page by page.
Mobile tests run on a slower, throttled connection, so render-blocking scripts, oversized images and heavy styles hurt more. We find which of them dominate on your pages.
That report is built from real visitor data. We map each failing group of URLs to the template behind it and the metric that fails, so the fix targets the cause.
Layout shift usually comes from images without dimensions, late-loading banners, fonts and embedded forms. We reserve space for them before they appear.
Each new script, plugin or tracking tag adds weight. We list what each one costs, what can be delayed and what can be removed.
Scores move between test runs and as the site changes. We judge by the median of several runs and by field data, and we leave a watch list for when new features ship.
PageSpeed Insights field data where it exists, Lighthouse in the lab and Search Console's Core Web Vitals report, recorded per template.
For each template we identify the element behind Largest Contentful Paint, the scripts that block the main thread and the causes of layout shift.
Typical work: a pre-built and trimmed stylesheet, resized and modern-format images, deferred or delayed scripts, reserved space for late content, caching and compression.
We re-run tests several times and use the median, and we keep a record of changes that did not help and were reverted.
A short list of what to check when you add scripts, plugins or large images, and the numbers to monitor in Search Console.
Our case study rebuilt the performance of a custom-coded business site without changing its design. It reports a 16 to 98 mobile speed score on the homepage in Lighthouse, and it lists the experiments that made things worse and were reverted. Lab scores differ from real-visitor data, so read the case study for the tool and device settings behind the number.
Google includes page experience signals, among them Core Web Vitals, in its ranking systems, but relevance and content quality usually matter far more. Speed work protects conversions and removes a weakness. It is not a shortcut past weak content.
Google publishes a threshold for each metric and judges them on real visitor data. We aim to bring each template into the range Google marks as good, and we check the current thresholds when we start.
Lab tools such as Lighthouse are repeatable and good for finding fixes. Field data comes from real Chrome visitors and is what Search Console reports. We use lab tests to find fixes and field data to judge whether they worked.
Not unless you ask. Our case study kept design, copy and colors unchanged, and we aim for the same by default: smaller files, less blocking code and reserved space.
Yes, the measurements are the same on any platform. The fixes differ: on WordPress they often involve plugins, themes and the image library, and on Shopify apps and theme code. We check which levers your platform gives us.
Book a call and we will look at which templates are slowing your site.
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