tl;dr:"High-percentile latency is a bad way to measure efficiency, but a good (leading) indicator of pending overload. If you must use latency to measure efficiency, use mean (average) latency."
tl;dr:Marc enjoys Rust and hopes it'll grow. "The long-term success of Rust as a systems language is going to depend on how well the community and tools handle unsafe. A lot of the value of Rust lies in its safety, and it's still too easy to break that safety without knowing it."