List performance in Sage (Python)

list.sage

n = 140000

L = []
start = cputime()
for i in range(n):
  L = L + [i]
diff = cputime(start)
print diff

L = []
start = cputime()
for i in range(n):
  L.append(i)
diff = cputime(start)
print diff

output

sage: runfile list.sage
60.316661
0.02