[peatmoss]

Some apparently regularly updated benchmarks comparing implementations of scheme: https://ecraven.github.io/r7rs-benchmarks/benchmark.html

Chez isn't always the fastest, but it's the fastest so often that I wouldn't look much beyond it if performance were of major importance to me. It's been written about here on HN before, but the next major version of Racket will be based on Chez. Chez will get package management, libraries, and modern tooling of Racket, and Racket will (presumably) be able to capitalize on the performance of Chez.

Of course if you come from, say Python, performance shouldn't really matter much to you, as pretty much all the schemes are already playing in a different league: http://benchmarksgame.alioth.debian.org/u64q/compare.php?lan...