How can I check the effect of tracking on website performance?

Measure a representative page and checkout journey before and after the agreed tracking implementation under comparable conditions. Review network requests and script work, and compare loading speed, responsiveness and visual stability. Check mobile devices as well as desktop. Google's Core Web Vitals provide useful measures for those aspects of the experience.

Use the supported TradeTracker integration and check for duplicate tags or unnecessary additional scripts. Assess performance and tracking accuracy together: a fast page with a missing conversion event is not a successful implementation. Discuss the appropriate first-party, Hosted Tracking or S2S setup with your technical contact. Server-side reporting can change browser work, but it does not guarantee zero performance impact.

Related glossary: Client-side tracking, S2S tracking, Tracking test

Sources: Google: Core Web Vitals, TradeTracker FAQ: testing a tracking implementation