![]() ![]() The initial document took 143ms to return from the server.Ģ83 requests is unexpectedly high, and overboard for a product details page (or really, anything).Network Tab view of the VaporFly Product Details Page Loading We’ll start on the Network tab of the developer tools. We can see that the page “feels” slow, but can we quantify it? Can we determine which specific pieces are responsible for the slowness? Performance Auditing with ChromeĬhrome has great performance diagnostic tools. Particularly jarring is the product image rendering below the title and then jumping above it. There are several layout shifts occurring making the page load look janky.(The free shipping banner, the “Sign in to Buy” button etc.) There are multiple asynchronous parts rendering at different times causing contentful paint events.Subjective to be sure, but it’s over 5 seconds. The VaporFly Product Details Page Loading With outdoor exercise increasing in popularity post-COVID, Nike’s running shoe offerings are compelling (arguably too compelling) and we want to buy some.īut the experience on mobile when we navigate to a product details page for a VaporFly shoe is slow and janky. ![]() Let’s look at a popular online retailer:. Poor performance is often a confluence of factors: slow time to first byte, hundreds of resource requests, and way too much JavaScript. Despite the importance of page experience for SEO, many sites still suffer unacceptable load times. Google has long used website performance as a ranking criteria for search results. ![]()
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