FlowStack's marketing site was actively losing signups before a single word was read — a 9-second load time on a bloated legacy stack. Here's how a Next.js rebuild cut load time by 84% and bounce rate by 46%.
FlowStack
B2B project-management SaaS platform
9s load time, high bounce rate
Legacy stack, unoptimized images, no caching strategy
8-week rebuild
Fixed price, fixed timeline
Web Development
Next.js rebuild, Core Web Vitals optimization
FlowStack's marketing site ran on an aging legacy stack that had accumulated years of unoptimized images, unused scripts and no real caching strategy. Homepage load time on real mobile connections stretched past 9 seconds — long enough that most visitors never saw the pricing page at all. Paid traffic from LinkedIn and Google was landing on a page that actively pushed people away before the product had a chance to make its case, and every marketing campaign was quietly fighting the website itself.
Profiled every render-blocking script, oversized image and third-party embed dragging down load time.
Rebuilt the marketing site on Next.js with static generation for content pages and image optimization built in by default.
Eliminated layout shift, deferred non-critical scripts, and tuned caching until every page hit green Core Web Vitals.
Rebuilt the pricing and signup pages to load instantly and get out of the way of the conversion action.
Tested load time and interactivity on real 4G connections, not just fiber, before sign-off.
Zero-downtime launch with real-user monitoring in place to catch any performance regression immediately.
Speed is a growth lever, not a vanity metric. The moment load time dropped under 2 seconds, the same LinkedIn and Google campaigns that had plateaued started converting meaningfully more trial signups.
An 84% reduction in load time, measured on real mobile 4G connections, not just fiber.
Visitors now actually stay long enough to see the product's value proposition.
The exact same marketing campaigns converted significantly more once the site stopped fighting them.
"Most agencies vanish post-launch. ZielDigital set up training, handed us full ownership of the code, and their support plan means fixes happen same-day."
Load time and Core Web Vitals are measured via PageSpeed Insights and real-user monitoring on production traffic. Bounce rate and trial-signup figures come from GA4, compared across equivalent traffic periods before and after launch. Timeframe and starting baseline stated above, as with every case study we publish.
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