[~/src/source (pants/1.3.0.dev2)]$ time ./pants --enable-v2-engine list 3rdparty/:: > /dev/null

real	0m5.905s
user	0m4.972s
sys	0m0.794s
[~/src/source (pants/1.3.0.dev2)]$ time ./pants list 3rdparty/:: > /dev/null

real	0m3.370s
user	0m2.631s
sys	0m0.571s