For me, it's "fast" meaning developer time. A typical first pass at a Rails view might be 300ms vs. 300 micro secs in Phoenix. This extra headroom represents ho

For me, it's "fast" meaning developer time. A typical first pass at a Rails view might be 300ms vs. 300 micro secs in Phoenix. This extra headroom represents hours of optimization I don't need to do, in order to stay under 200ms per request.