Really solid write-up from the WooCommerce team on scaling performance (developer.woocommerce.com). The part that stands out for me is the edge-caching work, lowering TTFB by moving cache layers closer to the user is a big win for any store where latency is often the hidden bottleneck.
The long-term challenge is always balancing cache hit rates with dynamic content, but this approach feels like a big step in the right direction for reducing TTFB at scale.