LCP breakdown showed TTFB 0ms and Element render delay ~2,320ms: the data-URI logo
was ready instantly but couldn't paint until the render-blocking CSS request finished,
and that round-trip varied wildly on throttled 4G (LCP 2.3s -> 6.8s, same code). This
is why the score bounced 71<->96 with no code change.
- experimental.inlineCss: fold the 64 KB CSS into the HTML so there is no separate
render-blocking stylesheet request on the critical path. Verified: homepage HTML
now has the CSS inline and zero <link rel=stylesheet>.
- Drop the two header-logo image preloads (both theme variants) that were stealing
slow-4G bandwidth from the critical path; the header wordmark is not the LCP and is
hidden during the splash.