I have a student, Julie Kienzle, working this summer on the evolution of Gambit’s performance over the history of the commits. The graphs produced by her work up to now are here:
http://gambitscheme.org/~kienzle/charts/web/graphics-web.html
There are graphs giving the geometric mean of all benchmarks in various settings (32/64 bit single/multiple hosts, with safe/unsafe declarations, etc), and also graphs for individual benchmarks.
Comments are welcome.
Marc