Ezio Melotti added the comment:
re.compile seems twice as fast as pickle.loads:
import re
import pickle
import timeit
N = 100000
s = "r = re.compile('[\\udc80-\\udcff]')"
t = timeit.Timer(s, 'import re')
print("%6.2f <- re.compile" % t.timeit(number=N))
s = "r = pickle.loads(p)"
p = pickle.dumps(re.compile('[\udc80-\udcff]'))
t = timeit.Timer(s, 'import pickle; from __main__ import p')
print("%6.2f <- pickle.loads" % t.timeit(number=N))
Result:
5.59 <- re.compile
11.04 <- pickle.loads
See also #2679.
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<http://bugs.python.org/issue11454>
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