The Silent Checkout Killer That Has Nothing to Do With Your Copy or Offer
You Know That Feeling When You Tap a Button and Nothing Happens? You tap it again. Still nothing. You tap it a third time.. and now you're not sure if you just bought something three times or if the whole thing is broken. So you leave. 😮 Your visitors are doing this on your funnel right now. It ain't because anything is jacked up.. The page loaded fine. Everything looks perfect. But when they tap.. there's a delay. Long enough to create doubt. Long enough to tap again. Long enough to decide this site doesn't work and leave. That's INP. Interaction to Next Paint. Google replaced their old responsiveness metric with it in March 2024 because the old one only measured the first tap. INP measures every tap, every click, every form field interaction for the entire session. Under 200ms is good. Over 500ms is poor. Your checkout button might be sitting at 600ms right now and your analytics has no idea. Here's what causes it. Heavy JavaScript running in the background -- your chat widget, your affiliate tracker, your heatmap tool, your analytics tag -- all of it shares the same thread as your page interactions. When those scripts are busy, your button waits. Your visitor doesn't feel the scripts. They feel the button not responding. On desktop with a fast processor, the wait is barely noticeable. On mobile -- where your paid social traffic lives -- it's the difference between a tap that feels instant and a tap that feels broken. 90% of user time on a page happens after it loads. INP governs that entire window. Every interaction. Every scroll. Every form field. Every button. The world's largest online bus ticketing platform improved their INP and saw a 7% increase in total sales. Not conversion rate on one page. Total sales. Here's the knife. Your visitor is on their phone, between meetings, ready to buy. They tap your order button. 600ms of silence. They tap again. The page registers both taps. Confusion. Doubt. Gone. You didn't lose them to a bad offer. You didn't lose them to weak copy. You lost them to a chat widget that was hogging the main thread at the exact moment they tried to give you money.