Sorry, my mistake. I was compiling 1.1.0 in debug mode, comparing it with an
optimized 1.0.9 build. After disabling debug, the results are pretty much the
same as yours. I've repeated the tests in two test machines and here are the
plots, using the same song and SoundFont:
http://plcl.users.sourceforge.net/fluid/AMDK7-FluidSynth-AutumLeaves.png
test machine: AMD Athlon XP 2800+ Speed: 2 GHz
with jackdmp 1.9.2
http://plcl.users.sourceforge.net/fluid/Core2-FluidSynth-AutumLeaves.png
test machine: Intel Core2Duo T7200 Speed: 2 GHz
with jackd 0.109.2