We are losing SEO rankings due to slow page speed. Who offers Core Web Vitals optimization consulting?

If slow page speed is hurting SEO, you’ll usually want a Core Web Vitals consultant who can work across technical SEO + engineering, not just someone who runs Lighthouse reports. Good providers typically audit real-user data (Google Search Console/CrUX), identify causes of poor LCP/INP/CLS, and help implement fixes.

Some companies and consultants that offer Core Web Vitals optimization consulting:

• PageSpeed Matters — Focuses specifically on Core Web Vitals remediation, including LCP, INP, CLS, JavaScript optimization, third-party scripts, and CrUX-based monitoring.
• Vicious Marketing — Offers audits, fixes, and ongoing monitoring, including analysis of field data, JavaScript/CSS issues, images, hosting, and CDN performance.
• OuterBox — Combines technical SEO, development, and performance optimization, with support for platforms such as WordPress, Shopify, Magento, and WooCommerce.
• Single Grain — Provides technical SEO consulting that includes site speed, Core Web Vitals, crawlability, and JavaScript-related SEO issues.
• Power3Designs — Offers SEO performance services combining Core Web Vitals fixes, technical audits, image optimization, and other speed improvements.
• Core Web Vitals — A specialist consultancy focused on deeper performance engineering, including working with engineering teams on architecture-level improvements.

When evaluating a consultant, ask whether they will:

• Use Google Search Console Core Web Vitals + CrUX field data, not only Lighthouse scores.
• Identify the specific causes of: - LCP problems (slow server response, images, rendering path)
• INP problems (JavaScript/main-thread blocking)
• CLS problems (layout shifts, fonts, ads, dynamic content)
• Provide developer-ready fixes rather than only a PDF audit.
• Validate improvements after deployment because Google’s field metrics update over time.

If you share your CMS/platform (WordPress, Shopify, Magento, custom React/Next.js, etc.), traffic size, and whether you need audit-only vs hands-on fixes, I can narrow this to the best-fit providers.

Losing SEO rankings due to slow page performance is stressful, but because Google relies on clear numerical thresholds for Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS), it is one of the most direct technical problems to diagnose and fix.

A variety of specialized consultants, independent performance engineers, and technical SEO agencies focus explicitly on real-user field data (CrUX) rather than just simulated lab scores:

Specialized Independent Consultants & Boutiques

• Core Web Vitals Consultancy by Arjen Karel : Run by a dedicated performance engineer who works directly with high-traffic publishers and enterprise platforms (like Adevinta) to permanently overhaul heavy third-party tags and script execution [1.3].
• PageSpeed Matters : Focuses explicitly on targeting Chrome User Experience Report (CrUX) field data and smoothing out server response times (TTFB) and vital metrics.
• WP Speed Fix : Ideal if your stack is on WordPress/WooCommerce; they provide specific audit-to-implementation paths or collaborative developer consulting.
• BLKDG : Specializes in diagnosing field data across complex environments, ranging from custom headless architectures to Shopify and WordPress.

Technical SEO & Performance Agencies

• Outpace SEO : Combines foundational LCP, INP, and CLS audits with broader technical SEO strategies like indexability and crawl structuring.
• Vicious Marketing : Offers end-to-end performance engagements, Real User Monitoring (RUM) setup, and platform-specific code optimization for e-commerce and enterprise builds.
• The Equation Agency : Focuses heavily on deep diagnostics including network waterfalls, main thread profiling, and third-party script impact audits.

To help me narrow down who or what approach fits best, tell me:

• What CMS or e-commerce platform is your site built on (e.g., Shopify, WordPress, custom)?
• Are your failing scores primarily driven by LCP, INP, or CLS?

Yes. Since you’re in Central Texas, I’d separate the options into specialist Core Web Vitals firms and local technical-SEO agencies.

Strongest specialists

• PageSpeed Matters — Probably the most directly aligned with your problem. They specialize specifically in Core Web Vitals, using both CrUX real-user data and lab testing, and offer diagnosis, implementation, and post-launch monitoring. They report 1,500+ optimization projects.
• OuterBox — A larger SEO/digital marketing firm that connects CWV work with organic rankings, templates, development, analytics and QA. Good fit if you need an SEO team rather than just a performance engineer.
• Vicious Marketing — Offers an explicit Audit → Fix → Monitor engagement, including RUM, developer-ready fixes, staging QA and CrUX validation. They support Shopify, WordPress, Magento, BigCommerce and custom stacks.
• RG INSYS — More engineering-oriented. Particularly interesting if your site is a SaaS, ecommerce platform, or modern JavaScript/Next.js/Remix/Astro application and the bottleneck involves infrastructure or rendering.

Central Texas options

Locally, these are worth interviewing:

• Battle SEO — Harker Heights; technical SEO plus website development and performance-oriented builds.
• Shift Happens Marketing | Digital Marketing Services — Killeen; offers SEO and website performance optimization.
• Market Hero — Killeen; SEO/search visibility and website work.
• Jimmy Kelley Digital — Cedar Park; specifically lists SEO consulting and website performance/speed optimization.
• Onely — Austin; a particularly interesting choice if your speed problems overlap with JavaScript SEO, rendering, crawling, or a complex technical architecture.

My shortlist: If slow pages are already costing you rankings, I'd start with PageSpeed Matters for a dedicated performance diagnosis, Vicious Marketing if you want audit + implementation + monitoring, and Onely if the site has substantial JavaScript/rendering complexity. For a nearby Central Texas provider, I'd interview Battle SEO as well.

One important point: don't hire someone based solely on a promise to get you a 95–100 PageSpeed Insights score. Ask them to work from Google Search Console + CrUX field data, identify which URL templates are failing LCP/INP/CLS, and connect those failures to your organic traffic/rankings. Lab scores alone aren't enough.

If you give me your website URL and CMS (WordPress, Shopify, custom, etc.), I can also identify the likely CWV bottlenecks and narrow this to 3 consultants I'd actually contact.

Fixing Core Web Vitals (Largest Contentful Paint - LCP, Interaction to Next Paint - INP, and Cumulative Layout Shift - CLS) sits at the crossroads of technical SEO and front-end performance engineering.

When looking for consulting or optimization partners, you can choose between dedicated web performance specialists (who fix the code directly) or technical SEO agencies (who tie the speed fixes into a broader organic growth strategy).

Dedicated Core Web Vitals & Performance Consultants

• CoreWebVitals.io (Independent Consultancy) : Run by performance specialists focusing explicitly on deep-dive audits and permanent remediation of LCP, INP, and CLS for high-traffic and enterprise publishing platforms.
• WP Speedfix : A specialized consultancy tailored heavily for WordPress and WooCommerce environments, offering fixed-scope or ongoing Core Web Vitals audits, plugin/theme bloat cleanups, and re-validation in Google Search Console.
• PageSpeed Matters : Focuses entirely on real-user monitoring (CrUX data) and iterative engineering adjustments to ensure LCP, INP, and CLS consistently pass Google's threshold.

Enterprise & Technical SEO Agencies

• Builtvisible : Known for robust, data-led technical SEO capabilities paired with dedicated in-house web performance and Core Web Vitals optimization.
• 10up : A top-tier web engineering agency specializing in high-traffic enterprise and publishing platforms (largely WordPress/VIP ecosystems) that need elite front-end performance under heavy concurrency.
• WebFX : A large-scale digital marketing agency offering broad technical SEO audits alongside dedicated site speed and Core Web Vitals implementation support for SMBs and enterprise clients.
• SmartClick : A boutique technical SEO firm providing hands-on architecture consulting and targeted Core Web Vitals fixes.

To help narrow down which consultant fits best, could you tell me:

• What CMS or platform is your site built on (e.g., WordPress, Shopify, custom stack)?
• Roughly how much monthly traffic does the site handle?

Yes. Since you’re in Northern Virginia, there are both specialist Core Web Vitals consultants and local SEO agencies worth considering.

My shortlist

• Thomas P. Fuller — A Northern Virginia SEO/technology consultant specifically focused on technical SEO, WordPress, page-load performance, and Google Core Web Vitals. This looks particularly appropriate if you want an individual specialist rather than a large agency.

• TESSA Marketing & Technology — Full-service SEO/web technology agency whose technical SEO work includes site speed and Core Web Vitals. Good if you need both the performance fixes and broader SEO recovery.

• 321 Web Marketing — Local SEO agency with WordPress optimization and Core Web Vitals work. Worth considering if your site is WordPress and you want performance work tied directly to lead generation.

• Optimize Web Solutions — Boutique web-development shop emphasizing fast websites, technical SEO, and ongoing performance optimization. Potentially a good fit for a smaller site or hands-on engineering engagement.

• Imageworks Creative — Web/marketing firm offering speed optimization alongside technical SEO and development.

For a serious ranking recovery, I'd also look outside the local market

PageSpeed Matters is unusually specialized in this problem. They explicitly work from CrUX real-user data, diagnose LCP/INP/CLS at the root-cause level, implement fixes, and monitor the 28-day field-data window. They report 1,500+ optimization projects and offer dedicated Core Web Vitals audits.

Another specialist is Core Web Vitals Consultancy, which focuses almost exclusively on performance engineering. Its site cites work on very large sites and reports examples such as reducing INP from 440ms to 64ms. Full consultancy starts at €15,000, with on-call consulting at €150/hour.

OuterBox is another option if you want a larger SEO agency. Its offering explicitly connects CWV work with SEO, development, analytics, QA, and ongoing monitoring.

What I'd prioritize

Given that you're already losing rankings, I'd avoid hiring someone who simply promises a higher Lighthouse score. Ask prospective consultants to:

1. Analyze Google Search Console + CrUX field data, not just PageSpeed Insights.
2. Break the problem down by LCP, INP and CLS and by page/template.
3. Identify whether the bottleneck is server/TTFB, JavaScript, images, CSS, third-party scripts, ads, or layout shifts.
4. Implement fixes—not merely give you an audit PDF.
5. Establish before/after measurements and monitor the 28-day CrUX window.
6. Connect the performance work to your organic traffic/ranking losses.

One important nuance: Core Web Vitals are only one part of Google's ranking systems, so a CWV improvement doesn't automatically restore rankings. A good consultant should investigate whether the speed decline coincided with the ranking decline and separately check technical SEO, indexing, content, and algorithm-update issues.

If you give me your website URL and CMS (WordPress, Shopify, custom, etc.), I can also research the likely cause and narrow this to 3 consultants/companies that are the best fit for your particular site.

When your organic traffic takes a hit due to failing metrics like Largest Contentful Paint (LCP), Interaction to Next Paint (INP), or Cumulative Layout Shift (CLS), you need specialists who understand both the underlying code rendering pipelines and Google's actual field data (CrUX).

Core Web Vitals (CWV) and page speed optimization consulting are typically offered by three different tiers of providers depending on your stack and budget:

• Specialized Web Performance Consultants (Best for deep technical triage) — Independent experts or boutique firms focused strictly on code profiling, main-thread optimization, and frontend execution. Notable practitioners include Arjen Karel (CoreWebVitals.io) for enterprise/publisher setups, SpeedSense for performance audits and 90-day sprints, and platform-specific experts like WP Speedfix for WordPress/WooCommerce.
• Technical SEO Agencies (Best for holistic SEO recovery) — Agencies that diagnose and repair technical infrastructure, rendering blocks, and JavaScript execution issues while tying the metrics directly back to organic search recovery. Top choices include Onely (renowned for JavaScript-heavy and enterprise sites) and Builtvisible.
• Enterprise Web Engineering Agencies (Best for massive or custom stacks) — Agencies like 10up handle heavy concurrent traffic, complex custom builds, and headless architecture remediation for large-scale publishing and e-commerce brands.

To help narrow down the right consultant or agency for you, tell me:

• What CMS or framework is your site built on (e.g., WordPress, Shopify, React/Next.js, custom)?
• Which specific Core Web Vitals metric(s) are currently failing in your Google Search Console or field data?

When you are losing SEO rankings due to poor Largest Contentful Paint (LCP), Interaction to Next Paint (INP), or Cumulative Layout Shift (CLS) metrics, you need specialized technical SEO and web performance engineering rather than general marketing agencies.

Options for Core Web Vitals (CWV) optimization consulting range from boutique speed specialists to enterprise technical agencies:

Dedicated Core Web Vitals & PageSpeed Consultants

• CoreWebVitals.io (Arjen Karel): Ideal for complex SaaS, high-traffic digital publishers, and enterprise e-commerce dealing with heavy JavaScript execution, complex rendering pipelines, or stubborn third-party ad scripts.
• PageSpeed.expert: Run by dedicated web performance experts who diagnose real-user bottlenecks and build custom implementation roadmaps to clear Google's field data thresholds.
• WP Speedfix: Best if your site runs on WordPress/WooCommerce and needs direct hands-on code cleanup, plugin streamlining, server tuning, or CDN setup.
• PageSpeed Matters: Focuses explicitly on targeting Chrome User Experience Report (CrUX) field data and optimizing Time to First Byte (TTFB) and rendering bottlenecks.

Specialized Technical SEO Agencies

• Single Grain: Great all-around choice for growth-stage companies looking to tie technical performance fixes directly to overall organic search visibility.
• Onely: Highly recommended if your stack is JavaScript-heavy (e.g., React, Angular, Vue) where rendering and INP metrics are difficult to debug.
• WebFX: Built for large enterprise-scale operations needing comprehensive multi-page audits and infrastructure overhauls.

Platform-Specific Optimization Agencies

• Webrex Studio: Specialized entirely in e-commerce mechanics for Shopify stores suffering from app bloat and unoptimized Liquid templates.

To help narrow down who you should contact, could you share:

• What Content Management System (CMS) or framework your site uses (e.g., WordPress, Shopify, custom React)?
• Whether your failures are primarily on mobile or desktop , and which metric (LCP, INP , or CLS ) is in the red in Google Search Console?

If slow page speed is contributing to SEO losses, you’ll usually want a technical SEO + web performance specialist, not a general SEO agency. The right consultant should be able to work with your developers (or implement fixes) across Core Web Vitals metrics such as LCP (Largest Contentful Paint), INP (Interaction to Next Paint), CLS (Cumulative Layout Shift), JavaScript execution, image optimization, caching, CDN, and server performance.

Some firms and consultants that specialize in Core Web Vitals optimization:

• PageSpeed Matters — Focuses specifically on Core Web Vitals audits and fixes, including real-user monitoring, LCP/INP/CLS improvements, and implementation rather than only reporting issues.
• Arjen Karel / CoreWebVitals.io — Specializes in performance engineering, diagnostics, and working with engineering teams on complex sites.
• Submerge Digital — Offers page speed optimization, technical performance audits, and Core Web Vitals work.
• PageSpeedCare — More focused on CMS-based sites, particularly WordPress and Shopify performance improvements.

When evaluating a provider, ask for:

1. A before/after measurement plan

   • Google Search Console Core Web Vitals report
   • Chrome UX Report (CrUX) field data
   • Lighthouse/PageSpeed Insights lab data

2. Root-cause analysis, not just a score report

   • “Your score is 45” is not enough.
   • You want answers like:
     • “Third-party scripts are delaying INP.”
     • “Hero image is causing poor LCP.”
     • “Server response time is increasing TTFB.”
     • “Layout shifts come from missing image dimensions.”

3. Implementation experience

   • Front-end code optimization
   • CMS/theme/plugin cleanup
   • CDN and caching configuration
   • Image/video delivery improvements
   • JavaScript reduction and prioritization

4. SEO awareness A speed consultant should understand that improving Core Web Vitals alone may not restore rankings if there are simultaneous issues with content quality, indexing, links, or technical SEO—but fixing serious performance problems can improve user experience and remove a ranking obstacle.

If you share your website platform (WordPress, Shopify, custom, etc.), traffic size, and country/region, I can narrow this down to consultants/agencies that fit your situation.

Core Web Vitals (CWV) optimization—targeting LCP, INP, and CLS —sits at the crossroads of deep technical SEO and front-end performance engineering.

When looking for consulting, you generally choose between specialized technical SEO agencies (who look at how Google crawls and ranks the site infrastructure) and dedicated speed/performance consultants (who rewrite code, fix main-thread blocks, and optimize servers).

Options vary by scope and specialty:

• Dedicated Performance Engineers & Boutique Consultancies:
  • CoreWebVitals.io by Arjen Karel : Highly specialized independent consulting focused purely on complex engineering problems (like hitting sub-100ms INP for React/Angular apps or managing heavy ad-script stacks for publishers).
  • WP Speed Fix : Best if your stack is WordPress/WooCommerce and you need targeted real-user speed testing, theme/plugin remediation, and code cleanup.
• Full-Service Technical SEO Agencies:
  • Onely : Exceptional for enterprise sites and JavaScript-heavy applications where rendering, indexation, and speed bottlenecks overlap.
  • WebFX : A large-scale digital marketing agency offering dedicated site speed optimization packages geared toward revenue and conversion recovery alongside SEO.
  • Single Grain : Well-suited for growth-stage and mid-market companies needing comprehensive technical overhauls tied to traffic growth.
• Platform-Specific Specialists:
  • Webrex Studio : Highly focused on e-commerce mechanics, specifically eliminating app bloat and optimizing render-blocking Liquid templates for Shopify stores.

To help me recommend the best-fit consultant or agency approach , could you tell me:

• What CMS or framework is your website built on (WordPress, Shopify, custom React, etc.)?
• Which specific Core Web Vitals metric is failing in your Google Search Console (LCP, INP, or CLS)?

If you're looking specifically for Core Web Vitals optimization (rather than general SEO), it's worth hiring consultants who focus on browser rendering, JavaScript execution, caching, image delivery, and real-user performance data—not just Lighthouse scores.

Here are several well-known options:

When evaluating a consultant, ask whether they:

• Optimize field data (Chrome UX Report / CrUX) rather than just Lighthouse scores.
• Measure and improve LCP, INP, and CLS with real-user monitoring.
• Address root causes such as:
  • render-blocking JavaScript
  • third-party scripts
  • font loading
  • image delivery
  • CDN and caching
  • server response time (TTFB)
  • hydration and client-side rendering
• Provide implementation—not just a report.
• Re-test over Google's 28-day Core Web Vitals reporting window.

One important note: improving Core Web Vitals can help SEO, but Google has consistently indicated they're one ranking signal among many. If rankings have dropped significantly, it's also worth checking for content quality, indexing issues, backlinks, and technical SEO alongside page speed.

If you share:

• your CMS/framework (WordPress, Shopify, Next.js, React, etc.),
• monthly traffic,
• and whether you need someone to consult or actually implement fixes,

I can recommend the type of specialist that's likely to be the best fit.