The efficiency of wasm is really impressive. An optimised build of Stockfish with POPCNT evaluates positions at ~1500kn/s on a single core of machine. By contrast, the wasm build on https://lichess.org/analysis/r4rk1/p5b1/2p2n2/1p2p3/4P2q/P1N1B3/1PP1B1Q1/2KR3n_w#0 can compute ~42kn/s in the browser for the same position!
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Butter, an experimental programming language exploring ideas for low level efficiency, has one of the best looking roadmaps I've seen in a long time!
Air to ground and satellite connections for in-flight WiFi: https://onezero.medium.com/what-makes-it-possible-to-browse-the-internet-at-35-000-feet-1afaea83eb5
(It's expensive, affects the plane's shape and fuel efficiency, and the fastest is still only 100 Mbps!)
Sometimes when thinking on PL design, I worry about efficiency. Considering the num of successful AST-walking interpreters, it seems silly.