ACO for TSP with SML/NJ

I was asked about the performance of SML/NJ on my usual ACO for TSP test. I used Standard ML of New Jersey v110.67 from Debian apt-get. I ran it in the interactive shell; no Compilation Manager. I didn't experiment with Concurrent ML (I don't think it supports multi-core). Results:

              Time   Multiple   
           in secs       of C      
C              0.4          1
MLton SML      1.6          4     
SML/NJ         4.9         12
Alice SML    169.0        423

Results scaled up proportionally when I increased iterations by a factor of 10.