Clear definitions of the metrics, concepts, and signals that impact site speed, search rankings, user behavior, and revenue.
Mobile-first indexing means Google ranks your site based on its mobile version. If something’s missing from your phone layout, Google doesn’t see it.
Learn moreA CDN is a worldwide network of servers that delivers your site’s files from close to each shopper, so pages load faster and survive traffic spikes.
Learn moreAn edge server is a CDN server near your shoppers that serves cached copies of your pages and files, so requests skip the long trip to your origin.
Learn moreNetwork latency is the delay for data to travel between a shopper's device and your server. Every request pays it, so it sets a floor on load speed.
Learn moreA TCP handshake is the three-message exchange a browser and server complete before any page data moves. On distant or slow connections, it adds up fast.
Learn morePayment step latency is the time shoppers spend waiting at checkout's payment stage, for the card form to load and the order to go through.
Learn moreInteraction latency is the time between a click, tap or key press and the screen visibly responding. It's the raw number behind INP.
Learn moreA long task is any piece of browser work that blocks the main thread for more than 50 milliseconds, leaving clicks and taps waiting in line.
Learn moreDNS resolution time is how long the browser takes to turn your domain name into a server address. It's the first delay on every new visit.
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