I just ran a head-to-head comparison of SML/NJ and smlc on all the
benchmarks, for the first time since last August.  The results are at:
~sweeks/smlc/logs/benchmarks/1999-02-20-14:38:10.html
Summary.
  Out of 16 benchmarks:
    smlc is slightly slower (< 10%) on two benchmarks
    smlc is more than 2X faster on 10 becnhmarks
    smlc is between 20 and 50% faster on the remaining 4