正则表达式比startswith快是错的

某君曾云，正则表达式比startswith速度快，实验了一下发现根本是无稽之谈。

import re
from datetime import datetime
p = re.compile("^job:.*")

t1 = datetime.now()
for i in range(1, 100000):
    re.match(p, "job:1241234")
t2 = datetime.now()
print t2 - t1
for i in range(1, 100000):
    "job:1234234".startswith("job:")
t3 = datetime.now()
print t3 - t2

结果
0:00:00.375000
0:00:00.047000