With the Boehm GC, seq is faster in both of your benchmarks. The default ref-counting GC definitely has limitations. Also, it's probably better to initialise FastStack to the same capacity as the seq. 1000 vs 0 isn't really fair.
- FastStack - dynamically resizable data structure optimized for fas... Vladar
- Re: FastStack - dynamically resizable data structure optimize... mbaulch