LCP Is Failing on Mobile for Rural and Suburban LTE Users
Largest Contentful Paint failures on Canadian sites are frequently not visible on fast urban connections. When field data is examined by connection type or device type, the failure is concentrated in mobile users on LTE, which covers a large share of the Canadian market outside major cities. The root cause is typically an unoptimised above-the-fold image: served as a large JPEG, without WebP or AVIF encoding, without a preload hint, and without server-side responsive image selection. On a variable LTE connection, this is the difference between a two-second LCP and a five-second one.