Google project (short name AMP) launched in 2015 that solved the privacy/control problems of naive prefetching by keeping a simplified copy of each page on Google servers and prefetching it from there at SERP time. Provided strong privacy (no IP/referer leak to origin), tight Google control over cached content, and very lightweight pages. Downsides: a limited HTML framework, mobile-only, URLs starting at google.com, and required trusting Google not to modify pages. Superseded in spirit by Signed Exchanges.