mentioned this recently. I launched a Funnel recently and I noticed that clicks on my ads was very high but my landing page view on my ads manager was pretty poor. only about 28% landing page views compared to clicks. I checked my page speed with https://pagespeed.web.dev/ it showed my page was taking 7 seconds to load and I was losing 70% of my traffic because my slow speed. I had to compress the images and hosted my sales video on vimeo which was then embedded on the funnel. Speed dropped to 3 secs. This is very critical. check your page speed regularly.