Website speed optimisation cost depends on the causes of delay and the templates affected. Compressing images, replacing an expensive interface component and improving a server query are different tasks. A useful proposal starts with measurement and ends with comparable retesting.
Choose representative pages
The homepage does not represent the whole website. Include a service page, article, category and product where relevant. For a store, also check functional journeys involving the basket and logged-in users. Distinguish first visits from visits with cached resources.
Specify the evidence required
Ask for the problem, the change and its measured effect. Core Web Vitals address loading, interaction responsiveness and visual stability. The official Web Vitals guide explains these measurements. Laboratory results and real-visitor data provide different kinds of evidence.
- Baseline tests with dates, devices and selected URLs.
- Identified causes and proposed corrections.
- Checks of menus, forms, search and essential interactions.
- Comparable tests after the work.
- Documented limitations involving external scripts and services.
Why a score of 100 is insufficient
One excellent test does not establish the experience of every visitor. Aggressively delaying scripts may improve a score while breaking a form or measurement. Acceptance therefore needs functional checks as well as performance measurements.
Prioritise the budget
Address demonstrated bottlenecks on important pages first. Changing hosting or a theme should have an evidenced reason. Separate one-off improvements from ongoing monitoring after future changes.
Can faster loading guarantee more sales?
A speed test cannot support a precise sales promise. Audience, offer and purchase experience also matter. Request a project scope that names the pages, expected technical improvements, retained functions and evidence used to accept the work.
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