>>3
On the benchmarks published last year, Stalin was still finishing 38/57 tests (that's 3 more than Chicken interpreted) and acing a lot of benchmarks. In some tests, Stalin was like 10 times faster than the 2nd Scheme (Array1, fft, mbrot). https://web.archive.org/web/20190212174828/https://ecraven.github.io/r7rs-benchmarks/
Sure it's R4RS but it would be hard to optimize it further.