Speed is a conversion feature
Page speed is treated as an engineering concern, something that lives in a backlog ticket about image compression and bundle sizes, and that framing is why so many landing pages quietly haemorrhage conversions before they even render. Speed is not an engineering nicety. It is a conversion variable, owned by whoever owns the conversion rate, which on a lean team is you.
The data is stark
Portent studied more than 100 million page views across twenty sites, and the finding for B2B lead generation is hard to ignore: pages that loaded in one second converted roughly three times higher than pages that loaded in five seconds. Three times, from speed alone, on the same offer and the same traffic. The pattern holds in e-commerce too, where one-second pages converted at 3.05 percent against 1.68 percent at two seconds, conversion nearly halving with a single extra second of wait. These are not marginal effects you can ignore while you tune the headline. They are among the largest levers on the page, and they are invisible because the visitors who bounce on a slow load never appear in your engagement metrics, they simply leave before the page exists.
Every second is a paid click you threw away
Reframe it in money. When you pay for a click and the page takes five seconds to render, a large fraction of those clicks bounce before they see anything you wrote. You paid for the visitor and then lost them to a loading spinner. There is no copy, no offer, and no proof that can recover a visitor who left before the page appeared. This is why speed is a marketing variable, not an engineering one. It sits upstream of everything else on the page, and a slow page caps the return on every other improvement you make.
What to actually do
The fixes are not exotic. The usual culprit on a B2B landing page is an unoptimised hero, a large image or an autoplaying video that blocks the render. Compress the hero media, serve a lightweight poster image immediately, and lazy-load any video so it arrives after the page is usable rather than before. The goal is concrete: render the primary action, the headline and the call to action, in under two seconds, so the visitor sees what they came for almost instantly and the rest of the page fills in around it. You do not need a perfect performance score, you need the decision-making part of the page to appear fast. Treat the load time as a number you own and report on alongside the conversion rate, because they are two views of the same thing. A page that converts at five percent but takes four seconds to load is a page converting at five percent on the visitors who waited, and quietly losing the ones who did not.