Grit : 
              user     system      total        real
packobj       0.030000   0.270000   1.380000 (  1.507250)
commits 1     0.030000   0.070000   0.390000 (  0.409931)
commits 2     0.110000   0.170000   0.860000 (  0.896371)
log           0.350000   0.130000   0.850000 (  0.875035)
diff          0.190000   0.140000   1.940000 (  2.031911)
commit-diff   0.540000   0.220000   1.390000 (  1.463839)
heads         0.010000   0.070000   0.390000 (  0.413918)


Grit (with GitRuby) : 

              user     system      total        real
packobj       0.050000   0.010000   0.060000 (  0.078318)
commits 1     0.150000   0.010000   0.160000 (  0.174296)
commits 2     0.440000   0.040000   0.480000 (  0.522310)
log           0.490000   0.040000   0.530000 (  0.538128)
diff          0.370000   0.230000   2.250000 (  2.255974)
commit-diff   0.580000   0.260000   1.500000 (  1.553000)
heads         0.020000   0.100000   0.430000 (  0.455464)