The CacheBench write speeds appears to drop significantly under GCC 7.

SciMark2 is running at its prime with GCC 7.

SciMark2's win with GCC 7 comes down to Dense LU Matrix Factorization being faster than the three previous GCC releases.

In many of the benchmarks run, the performance changes were very minor.

GraphicsMagick is perhaps a little bit faster with GCC 7.