Your returning visitors load your store from cache, so they never feel what a first-timer feels. The first visit is a cold, uncached load on a mid-tier phone, and it is the one that decides whether a new shopper from an ad or a search result stays or bounces. This tool shows you that exact moment.
Paste a product or landing page and it runs a fresh Google Lighthouse pass, then hands back three things: the render filmstrip (frame by frame, when your hero image and price actually appear), the first-visit metrics scored against Google’s thresholds, and the part most speed tools skip, an app-by-app breakdown of how much blocking time each third-party script cost you on that first load, with its typical monthly price next to it. Most slow Shopify first-visits are not the theme. They are four apps fighting for the main thread while your shopper stares at a white screen.
Want the version that stings in a sales meeting? Drop a competitor’s URL in the second field and run a head-to-head. You get both filmstrips, both scorecards, and the app-cost delta side by side, the same “here is how you load versus your niche” view the paid tools charge for. It is free, runs in your browser, and stores nothing.