Lab Data (Synthetic Monitoring) and Field Data (Real User Monitoring) represent the two fundamental ways to measure website performance, each serving a distinct but complementary purpose.

User Frustration Signals are the digital body language of a website visitor. They are measurable behavioral cues that occur when a site fails to respond as intended.

Perceived Load Speed (PLS) is a subjective measure of how fast a website feels to a user, which is often more critical for retention than the actual technical load time.

Bounce Rate is a web analytics metric that measures the percentage of website sessions that are not considered “engaged” within Google Analytics 4 (GA4).

Time to First Byte (TTFB) is a performance metric that shows how quickly your server starts responding after a browser makes a request.

Cart abandonment signals are behavioral and technical indicators that suggest a shopper is likely to leave a website after adding items to their cart without completing a purchase.