Can an SEO company help with website speed optimization?
Yes. An SEO company can measure what is slowing your pages down, decide which fixes matter, and either make those fixes or hand your developer a precise list. Before you pay for that work, it helps to know how much speed counts in search. Google’s own answer is measured: its page experience documentation says that “Core Web Vitals are used by our ranking systems”, and also that “Google Search always seeks to show the most relevant content, even if the page experience is sub-par. But for many queries, there is lots of helpful content available. Having a great page experience can contribute to success in Search, in such cases.” Speed work is worth doing, for searchers and for visitors, but it does not replace relevant content.
Measurement first
The work starts with data rather than a general verdict that the site is slow. Google’s explanation of PageSpeed Insights describes the two kinds of data a company should look at: “PSI provides both lab and field data about a page.” Lab data comes from a controlled test and is good for finding causes. Field data reflects real visitors. A page can pass a lab test and still be slow for people on mobile connections, so a company that reports only lab scores is showing you half the picture. Search Console adds a Core Web Vitals report covering pages across the whole site.
The output of this stage should be a list of specific problems tied to specific pages or templates: slow server response, oversized images, scripts that delay the page from appearing, or elements that shift as the page loads.
Fixes mapped to what they improve
Each fix should be tied to the measure it is meant to move, which makes the work easy to check afterwards. Google’s three Core Web Vitals give the structure. Loading, measured by Largest Contentful Paint, is the target of work such as faster server response, caching, and lighter images. Responsiveness, measured by Interaction to Next Paint, is the target of work that reduces the JavaScript running on the page. Visual stability, measured by Cumulative Layout Shift, is the target of work that reserves space for images, ads, and embedded content before they load.
Ask the company to show you which fix it expects to move which measure. A plan that lists optimizations without that link is hard to evaluate.
Who makes the changes
Some fixes can be made by an SEO company directly, especially on common platforms. Others live in the theme, the code, or the hosting, and belong to a developer or your host. In those cases the company’s job is to write clear, specific requests, explain why each change matters, and check the result after it goes live. Ask which fixes the company will make itself, which need your developer, and how it confirms that a change worked.
The platform matters too. A custom-built site, a WordPress site, and a hosted store give you control over different things, so ask whether the company has done speed work on your platform before.
How to judge the result
Ask for reporting against the Core Web Vitals in field data, before and after the work, not only lab scores. Google describes field data as “a historical report about how a particular URL has performed”, so it takes time to reflect a change. A company that shows you a new lab score the day after a fix, and calls the job done, has measured the easy part.