Webflow's hosting is fast, but the page you build on top of it often is not. Interactions, sliders, embedded fonts, video backgrounds, and uncompressed images add up quickly, and the Designer preview on a fast desktop connection hides the cost. Real visitors on phones feel every extra second, and a headline that paints late is a headline many people never read.
Treat performance as a conversion factor, not a technical afterthought. Compress and correctly size images, lazy-load anything below the fold, limit heavy interactions to where they earn their keep, and prefer system or subset fonts over multiple heavy custom faces. Speed is not about a green score — it is about whether the visitor sees your promise before they give up.