US DTC brands committing to a $50K+ redesign treat Core Web Vitals targets and post-launch A/B tests as non-negotiable deliverables — not optional extras

The performance targets that Google uses to assess page experience are LCP (Largest Contentful Paint) under 2.5 seconds for a "Good" rating, INP (Interaction to Next Paint) under 200 milliseconds for a "Good" rating, and CLS (Cumulative Layout Shift) under 0.1 for a "Good" rating — all measured on mobile using the 75th percentile of real-user data in Google's CrUX dataset, or measured using lab data from a Lighthouse test run on the staging environment before launch. For US DTC brands on Shopify, LCP is typically the most challenging target to meet because it is most affected by hero image file size, image loading strategy, and the loading sequence of above-the-fold content. Contractually, the most defensible approach is to specify that the development team provides a pre-launch Lighthouse report from the staging environment showing all three targets met, with measurement conditions (device, network, and tool) specified in the scope.

A post-launch A/B test for a Shopify redesign typically uses a theme A/B test approach — serving the old published theme to 50 percent of visitors and the new theme to the other 50 percent — implemented through a split URL testing tool such as Google Optimize (now deprecated, with VWO or Optimizely as the current alternatives) or through a Shopify-native A/B testing app such as Shoplift. The test should run for a minimum of four weeks to account for day-of-week traffic variation, with a target of reaching statistical significance at a 95 percent confidence level before declaring a winner. Primary metric is conversion rate. Secondary metrics should include AOV and revenue per session, because a redesign that improves conversion rate but reduces AOV may not represent a net revenue gain. The test infrastructure should be configured and confirmed running on day one of launch, not set up in response to a concern about post-launch performance.

Shopify Plus checkout UI extensions available for inclusion in a redesign scope include: post-purchase offer pages that present a one-click upsell immediately after the order confirmation, order bump offers at the payment step that add a complementary product to the order without leaving the checkout flow, custom trust badge and security assurance placements within the checkout header, subscription conversion offers at the payment step for brands with a subscription product, and custom shipping method descriptions that add conversion copy to the standard shipping option names. Not all of these are relevant to every brand, but all should be evaluated in the redesign brief and included or explicitly excluded with a rationale. Brands that redesign the storefront without reviewing the checkout UI extension options are making a scope decision by omission rather than by evaluation.

The photography brief should be issued at the same time as the redesign brief, not after the design is approved. The design brief specifies the photography format requirements — aspect ratios for the homepage hero, product page image count and format, collection page lifestyle image dimensions — so that the photography brief can specify shot list and format requirements that match the design. The shoot date is set so that final edited images are delivered no later than the design handoff date, which is the date the development team needs final assets to begin building the store. Photography delivered after the design handoff date delays the launch because the development team cannot complete the build or QA with placeholder images and then swap to final images without retesting the layout. Including the photography timeline as a milestone in the project plan, with a design-handoff delivery deadline, is the mechanism that keeps the photography and redesign timelines aligned.

Conversion lift from a data-informed e-commerce redesign — where the brief is driven by a conversion audit rather than aesthetic preferences — typically ranges from 15 to 40 percent improvement in conversion rate in the first 90 days post-launch, based on published case studies from US DTC brands on Shopify and Shopify Plus. The range is wide because the lift depends directly on how large the conversion barriers in the existing store were: a store where the checkout was broken on a specific device combination and the redesign fixed it will see a larger lift than a store that was already converting at 3.5 percent and needed a brand refresh rather than a structural fix. The most reliable predictor of conversion lift from a redesign is the size of the conversion gaps identified in the pre-redesign audit. A larger gap means more room for improvement. This is why the audit is the starting point for every redesign brief, not an optional preliminary.