Sander van Surksum | Web Performance Consultant
Sander van Surksum is a web performance consultant at Iron/Out, specialising in Core Web Vitals optimisation for enterprise e-commerce and SaaS companies. With years of hands-on experience improving Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS), Sander helps organisations translate performance metrics into measurable business results.
Sander works with development teams to identify bottlenecks in critical rendering paths, optimise resource delivery, and implement frontend observability strategies that ensure performance improvements are maintained long-term.
Expertise & Services
- Core Web Vitals audits – Identifying and prioritising performance bottlenecks in LCP, INP, and CLS
- LCP optimisation – Image delivery, resource prioritisation, and server response time improvements
- INP optimisation – JavaScript execution profiling and interaction responsiveness
- CLS remediation – Layout stability fixes across dynamic content and ad placements
- Frontend observability – Setting up RUM tooling and performance monitoring dashboards
- Performance culture – Training development teams on continuous performance practices
Why web performance matters
Web performance directly affects user experience, conversion rates, and search rankings. A 100ms improvement in page load time can increase conversions by 1–2%. Google's Core Web Vitals are a ranking signal, meaning poor performance visibility in search results.
Sander's approach combines technical depth with business context — every optimisation is measured against its impact on real users and revenue.
Visit sandervansurksum.nl for more about Sander's work and writing on web performance.
