Technical SEO & Core Web Vitals Optimization

Technical SEO audits and implementation covering indexing, website speed, Core Web Vitals, duplicate content and multilingual URLs.

Technical SEO & Core Web Vitals Optimization

Performance people can feel.

Technical SEO removes barriers to search indexing and usable pages. We review crawling, rendering, duplicate URLs, canonicals and hreflang alongside website performance. Core Web Vitals optimization targets measured LCP, INP and CLS issues, followed by checks of affected templates and essential user journeys.

  • Understand the cause

    Connect issues with a template, user journey and technical source.

  • Prioritize by impact

    Focus first on changes affecting important pages and actions.

  • Verify the change

    Compare like-for-like conditions and document remaining constraints.

What you get

What we deliver

Crawling and indexing

Review status codes, redirects, canonicals, robots, sitemaps and access to key pages.

Frontend performance

Investigate images, fonts, scripts, layout shifts and interaction delays.

Engineering-ready tasks

Document reproduction steps, proposed fixes and verification criteria for priority issues.

Regression monitoring

Choose representative pages and repeat checks after changes or releases.

From a report to a resolved cause

A tool’s warning list is only a starting point. The useful question is which change addresses the cause, what else it may affect and how the team can detect a regression.

Technical SEO issues we investigate

Indexing and complex catalogues

Review server responses, robots.txt, noindex, sitemaps, canonicals and internal links. Ecommerce reviews cover facets, pagination, duplicates and unavailable products. Technical eligibility does not guarantee indexing: the page's content and purpose also matter.

JavaScript and multilingual websites

Compare the initial HTML with the rendered page, including content, links, metadata and resource failures. Check language URLs, canonicals and reciprocal hreflang annotations. Automatic language redirects should not prevent access to alternative versions.

Performance and platform migrations

Investigate slow main content, delayed interactions and layout movement. Before a migration, map URLs and redirects; after release, check pages and critical journeys. Prioritisation considers impact and how many users or page templates are affected.

Audit, implementation and release verification

A reproducible issue backlog

Each finding includes a URL or template, reproduction conditions, evidence, expected behaviour and priority. Recommendations are distinguished from confirmed defects. Scoping requires the stack, available Search Console data and your important page types.

Agreed implementation

Development can be included or assigned to your team. Changes are checked in a test environment, with a rollback approach agreed before release. Indexing directives and URLs are not changed without an approved impact map.

Checks on the published version

Repeat checks after deployment and record issue status and remaining constraints. Test forms, menus, language switching and important business actions. Ongoing monitoring and regression response have an agreed period and scope.

A sample developer handover

Illustrative issues showing the format, not measurements from a client website. Actual values, URLs, device conditions and dates are recorded during the audit.

A sample developer handover
SymptomInvestigationVerification criterion
Main image appears late — LCPResponse time, resource discovery, size and priorityRepeat under the same lab conditions; review field data separately
Menu interaction is delayed — INPLong tasks, event handlers and main-thread workRetest the interaction and check for functional regressions
Content moves unexpectedly — CLSReserved media space, fonts and dynamic contentReproduce loading and interactions; inspect layout shifts

How a technical SEO audit is priced

Scope depends on templates, technology, languages, analytics readiness and access to code and environments. The proposal separates audit, development, deployment and verification. It includes the URLs or page types being reviewed and the acceptance criteria.

To start, share your website, observed problem, CMS or stack and any planned migration. Search Console, analytics, repository or log access is agreed according to the task. Your data and access remain under your control; you receive the change log and verification results.

LCP, INP and CLS: evaluating improvements

Good Core Web Vitals targets are 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, segmented by mobile and desktop. These are user-experience targets, not a promise of Google rankings.

Lab testing helps reproduce and verify a defect. Field data reflects real visitors; CrUX summaries use a rolling 28-day window, so a release is not reflected immediately. Where URL data is insufficient, we identify the aggregation level and do not present a Lighthouse score as proof of passing field CWV.

From brief to launch

A clear path to launch

  1. Establish a baseline

    Collect lab measurements and available field data.

  2. Find bottlenecks

    Investigate representative pages and devices.

  3. Implement the plan

    Coordinate changes and dependencies with engineers.

  4. Verify the outcome

    Repeat the journeys and leave a reusable check set.

Before we start

Good questions before we start

Do you promise a perfect Lighthouse score?

No. Scores depend on conditions, content and third-party services. The goal is measurable improvement in user journeys with understood trade-offs.

Why do field and lab results differ?

Lab tests use controlled conditions; field data reflects different visitors over time. We analyze both sources without treating them as interchangeable.

Can we commission only the audit?

Yes. You receive prioritized tasks and verification criteria. Implementation and follow-up validation can be scoped separately.

Why is an accessible website page not indexed by Google?

We review server responses, directives, canonicals, duplicates, internal links and page content. Crawl accessibility is only one condition. The search engine's final indexing decision and timing cannot be guaranteed.

Do you work with JavaScript websites?

Yes. We review initial and rendered HTML, resource accessibility, links and metadata. Recommendations depend on the stack and observed issue; SSR alone does not resolve every SEO problem.

How do you check multilingual SEO?

We reconcile language URLs, canonicals, reciprocal hreflang, page status and sitemaps. Links should reach the equivalent published translation and navigation should allow explicit language selection.

What if PageSpeed has no field data?

We disclose the limited sample, review available origin-level data and use lab measurements for diagnosis. Your own real-user monitoring can be scoped separately and is identified as a distinct data source.

What is tested before fixes are released?

Alongside performance, we check forms, menus, purchases or other agreed journeys. SEO changes also require URL status, metadata and directive checks. Acceptance criteria and the rollback approach are agreed before deployment.

Can you support a site migration?

The scope can include old-to-new URL mapping, redirects, metadata transfer, indexing checks and post-launch monitoring. A migration requires its own release plan and named responsibilities.

When can an improvement be evaluated?

Functional fixes are checked after release. Field metrics need new visits and an updated data window. The proposal defines the monitoring period and response to newly observed issues.

AVIAL SERVICE

Review your website’s technical foundation

Share the address and describe the issue: loading, indexing or a particular interaction.

Avial Service

Request an estimate for technical SEO

Tell us about your website and goal. We will clarify the scope, cost and next step. An inquiry does not commit you to a purchase.

Your contact email and phone are required for estimates and requests.

Details for an estimateOptional

Share your website and priorities. We can clarify access and details together.

Tools for your project

Estimate IT service costs, book a consultation and try an enquiry automation example. Use the website check to start a discussion about technical SEO and page speed.