Strategic In-House Consultancy

PageSpeed & Core Web Vitals Consultancy

Speed is revenue. Latency is risk. Turn your performance into a competitive advantage.

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What You Get

The Engagement Model

I structure this consultancy to deliver permanent improvements rather than temporary patches. We focus on three core phases to align your technical architecture with your business goals.

1. Deep Technical Analysis

I manually review your codebase and infrastructure to find the root causes of performance issues. I analyze your JavaScript execution, rendering patterns, and third party dependencies to identify exactly where we can recover speed.

2. Real User Monitoring

We implement CoreDash to gather precise data from your actual visitors. We use this field data to prioritize fixes based on their impact on revenue and user experience. This ensures we solve real problems for real users.

3. Engineering & Knowledge Transfer

I work directly with your developers to implement the necessary architectural changes. I set up performance budgets in your CI/CD pipeline and train your team on performance best practices. This ensures you maintain these results long after I leave.

Arjen - PageSpeed Consultant
Arjen
Arjen Karel
I provide the architectural precision and data driven
strategy you need for sustainable high performance.

Client Success

Don't just take my word for it

Target Clients

Who This Is For

This consultancy is designed for organizations operating at a scale where technical performance is a primary business asset.

Impact +15% Conv.

Enterprise
E-Commerce

Large scale storefronts with high transaction volumes. These businesses require a direct correlation between site speed, mobile conversion rates, and revenue.

High Volume
Conversion Focus
Revenue Critical
Target < 100ms INP

Complex SaaS
Applications

Web applications and dashboards with heavy user interaction. These platforms rely on low latency and stable Interaction to Next Paint (INP) to maintain user trust.

Low Latency
Stable INP
User Trust
Stability 0.00 CLS

Digital
Publishers

High traffic media sites managing complex ad stacks. These organizations must balance significant third party script loads with the strict Core Web Vitals requirements needed for search visibility.

Ad Stacks
Search Visibility
Script Balance


If you are looking for quick & immediate solutions to your Core Web Vitals challenges check out my on-call consultancy

Availability & Next Steps

I accept a limited number of strategic engagements per quarter. This ensures I can provide the focused attention your architecture requires.

If you are ready to secure your performance metrics and revenue, invite me for a preliminary discussion.

Book Your Strategy Call
Core Web Vitals

Straight answers on ROI, process, and technical impact

Investing in high-performance architecture is a strategic decision. You need to understand the return on investment, the integration with your current roadmap, and the technical depth of the deliverables.

I have compiled the most frequent inquiries I receive from decision makers and engineering leads. These answers define exactly how we turn your site performance into a competitive asset. If your specific architectural challenge is not listed here, contact me directly.

Strategy, ROI & Business Impact

What is the expected ROI of a Core Web Vitals consultancy?

The return is measurable in user retention and conversion. High-volume storefronts like Loop Earplugs saw a 7% conversion lift after reducing mobile load times by 800ms. Adevinta improved the overall Core Web Vitals metrics by 145% to secure ad revenue. I validate every optimization against Real User Monitoring (RUM) data to ensure the investment impacts your bottom line immediately.

Who is this consultancy designed for?

I work with organizations where site speed is a primary business asset. This includes Enterprise E-commerce requiring conversion stability, Complex SaaS applications needing low latency for user trust, and Digital Publishers balancing heavy ad stacks with search visibility. If you operate at scale, technical performance is not optional.

Do you guarantee specific Core Web Vitals scores?

I guarantee the maximum performance possible within your architectural constraints. My goal is to achieve "green" scores (passing site-wide CrUX metrics at the 75th percentile or better) across LCP, CLS, and INP. More importantly, I focus on the metrics that drive business success. We prioritize fixes based on their impact on real users and revenue rather than vanity metrics.

Why do we need a specialist instead of our current agency?

In general, good agencies apply standard best practices. I engineer performance based on browser execution models. I diagnose specific, complex bottlenecks that standard audits miss, such as hydration mismatches in Next.js or third-party script governance on high-traffic media sites. I provide the specific architectural expertise required to solve persistent performance issues.

Technical Scope & Stack Capabilities

What technology stacks do you support?

I optimize all major web architectures. I understand the deep mechanics of the browser, which applies whether you use Next.js, Nuxt, Magento, Salesforce Commerce Cloud, or a custom PHP stack. I handle complex environments including Single Page Applications (SPA), Server-Side Rendering (SSR) and heavy third-party dependencies.

How do you handle Interaction to Next Paint (INP) issues?

INP optimization requires precise management of the main thread. I specialize in diagnosing high-INP caused by heavy JavaScript execution and event processing delays. We profile input latency and processing times to implement yielding strategies and optimize event listeners. I ensure your application remains responsive even under heavy load.

Will we need to rewrite our entire frontend?

Complete rewrites are rarely necessary. I focus on surgical, high-impact changes. We optimize resource loading strategies, rendering paths and script timing. We often resolve site-wide failures by refactoring specific heavy components or adjusting hydration logic. I aim for maximum impact with minimal code disruption.

Do you provide Real User Monitoring (RUM)?

Yes. I implement CoreDash to gather precise data from actual visitors. This field data allows us to identify exactly what your users experience based on their device and connection. We use this data to prioritize engineering tasks that solve real user problems, rather than relying solely on synthetic lab data.

Workflow, Integration & Deliverables

How do you integrate with our engineering team?

I work directly within your existing infrastructure. I analyze the codebase to identify root causes and provide actionable, well-documented tickets. I transfer knowledge to your developers through code examples and configuration guides. My objective is to upskill your team so they can maintain high performance independently.

What are the specific deliverables of a full engagement?

You receive a deep technical analysis, a prioritized roadmap, and direct engineering support. This includes immediate fixes for CWV metrics, setup of performance budgets in your CI/CD pipeline, and a configured RUM dashboard. I deliver code, configuration changes, and documentation, not just a PDF report.

How do you prevent performance regressions?

We automate performance quality. I help you implement performance budgets and monitoring tools within your deployment pipeline. If a new feature introduces layout shifts or main-thread blocking, the system flags it immediately. We establish a process where performance is monitored continuously.

What is the difference between an Audit and Full Consultancy?

An audit identifies the problems. Consultancy solves them. If you have a strong team that just needs direction, an audit or short consult provides the roadmap. If you need an expert to dive into the code, configure the servers, and guide the implementation to ensure the results are achieved, Full Consultancy is the correct choice.

Results, Timelines & Ad Revenue

How quickly will we see improvements in our Core Web Vitals?

You will see changes in our Real User Monitoring (CoreDash) immediately after deployment. We do not wait for the 28-day Google CrUX report to validate our work. My process typically delivers measurable performance gains within the first sprint of implementation. We verify fixes in real-time, allowing us to iterate fast and secure your "pass" assessment weeks before standard tools report it.

Can we pass Core Web Vitals without removing our Ads or Analytics?

Yes. You do not need to choose between ad revenue and performance. I specialize in "Third-Party Governance." We will not remove your tags; we will change how and when they load. I implement strategies that allow your ads to viewability requirements without blocking the main thread or causing layout shifts. My publisher clients maintain their RPM while passing Core Web Vitals.

What do you need from us to get started?

I aim for zero friction. I need access to your staging environment, your repository (GitHub/GitLab), and your current analytics. I do not require weeks of onboarding meetings. Once I have access, I begin the deep technical analysis immediately. We can usually go from "contract signed" to "first findings delivered" within 5 business days.