What are Core Web Vitals and which ones matter?

They are three measures of user experience: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. Field data from real visitors matters more than a single lab score, because it reflects actual devices and connections. Ask which data source a Zinner is optimising against before work starts.

Why does my score differ between testing tools?

Testing tools use different devices, network throttling, locations and weightings, and lab tests simulate one visit while field data aggregates real ones. A score can also change between runs on the same tool because of caching and third-party variability. Agree one tool and one test configuration as the benchmark, and always compare like with like.

How is speed optimization work priced?

Each Zinner sets and shows their own price in USD on the listing. An audit that identifies problems and a remediation project that fixes them are usually separate scopes. Check whether the listing covers a single page or the whole site, whether hosting-level changes are included, and how many follow-up adjustments come with it.

Will optimisation break my site design or functionality?

It can if done carelessly. Deferring scripts, minifying assets and combining files are the usual causes of broken sliders, forms and interactive elements. Insist on a full backup, staging testing where possible, and a documented list of changes so anything can be reversed. Test forms, checkout and logged-in views yourself after the work.

What access does a speed specialist need?

Typically administrator access to the site, file access via SFTP, and sometimes hosting control panel or CDN access for server and caching changes. Create dedicated accounts rather than sharing yours, ensure a restorable backup exists before anything changes, and remove the access when the work is complete. Ask for a written record of what was changed.

How do I verify the improvement afterwards?

Record baseline measurements before the work using one tool, one page set and one configuration, then repeat exactly that test afterwards. Compare time to first byte and the Core Web Vitals separately rather than relying on a single composite score, and check field data over the following weeks, since real-user metrics take time to update.

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