Perhaps of interest...

Recently upgraded from Ubuntu 14.04 to 16.04 and looked again at the 
performance issue (github #48) on recompile to see what might have changed.

The 3.7.0 stable to current 3.7.1 --benchmark degrade in performance is 
still there, but less so, and 16.04 due the compiler updates or whatever 
else new ends up faster for both 3.7.0 stable and 3.7.1.

      i3-4130 @ 3.40GHz × 4  Haswell

----- Ubuntu 14.04 April 25, 2016
       (3.7.0 stable -> 3.7.1-alpha.8581629)

CPU    1104.82s -> 1310.64s +18.63%
Memory 34824KB  -> 34296KB   -1.52%

----- Ubuntu 16.04 August 13, 2016
       (3.7.0 stable -> 3.7.1-alpha.8704732)

CPU    1062.16s -> 1245.73s +17.28%
Memory 37412KB  -> 37980KB   +1.52%


---- Ubuntu 14.04 (4.8.?)  -> 16.04 (g++ 5.4.0)

           3.7.0  3.7.1
        +---------------
CPU    | -3.86%  -4.95%
Memory | +7.43% +10.74%

Ubuntu upgrade looking to be generally good news with respect to POV-Ray.

Bill P.

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