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Issue 030BenchmarkPerformanceRef 090

CLS on PDP: the layout shifts merchandisers keep introducing and how to stop them

Cumulative Layout Shift (CLS) on Product Detail Pages (PDPs) is a critical Core Web Vitals metric, often exacerbated by marketing and merchandising teams. Understanding common causes and implementing technical and procedural guardrails is essential for maintaining page stability and user experience.

Neil Boughton· Technical Director
5 min readReviewed December 2024
"A significant proportion of CLS issues often stem from content changes introduced by merchandisers and marketers, often due to a lack of awareness."
Written by
Neil Boughton, Technical Director at iWeb
Neil Boughton
Technical Director
29 years at iWeb

Neil leads platform architecture and integration strategy at iWeb. He has designed ERP and commerce integration patterns across manufacturing, wholesale and retail, and writes about operational resilience, release governance, observability, and the infrastructure decisions that determine whether large programmes stay stable under pressure. Bias toward durable, measurable systems over architectural theatre.

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