Direct answer: audit the transitions users actually experience
A single-page application should not be declared fast from its initial load alone. Audit the JavaScript-driven, same-document transitions that move a visitor from an entry page to a service detail, proof page, form and confirmation state. Google Chrome’s Web Platform documentation explicitly identifies soft-navigation measurement as a way to measure the performance of JavaScript-driven same-document navigations, including those used by SPAs. It also describes Long Animation Frames as a diagnostic API for finding slow animation frames likely to affect Interaction to Next Paint, a Core Web Vital concerned with responsiveness.
Chrome also lists the Navigation API for modern client-side routing and the Speculation Rules API for prefetching or prerendering pages. These are platform capabilities, not promises of better rankings, more leads or universal browser support. Chrome warns that parts of its Web Platform catalogue can be experimental, available through trials or limited to Canary. The correct commercial response is therefore an evidence-led audit, not indiscriminate adoption.
Confirmed platform fact: Chrome documents measurement for SPA-style soft navigations.
Confirmed platform fact: Long Animation Frames can help identify slow frames associated with responsiveness problems.
Confirmed platform fact: some documented web APIs may be experimental or tied to release channels.
CreatikLab interpretation: test complete lead journeys before selecting a routing, measurement or preloading intervention.
