numpy 2, item wise

test-vec2.py

from timeit import Timer
setup_user = """
from math import sqrt
a= [10,11,12]
def len_user(v):
    return sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2])
"""
setup_vector = """
from mathutils import Vector
a= [10,11,12]
def len_vec(v):
    return Vector(v).length
"""
setup_lambda = """
from mathutils import Vector
a= [10,11,12]
len_lambda=lambda a:Vector(a).length
"""
setup_np = """
from numpy.linalg import norm
a = [10,11,12]
def len_np(v):
    return norm(v)
"""
def test():
    t1 = Timer("""m = len_user(a)""", setup=setup_user)  
    print("user  ", min(t1.repeat(3,100000)))
    t2 = Timer("""m = len_vec(a)""", setup=setup_vector)  
    print("Vector", min(t2.repeat(3,100000)))
    t3 = Timer("""m= len_lambda(a)""", setup=setup_lambda)  
    print("Lambda", min(t3.repeat(3,100000)))
    t4 = Timer("""m = len_np(a)""", setup=setup_np)  
    print("Numpy ", min(t4.repeat(3,100000)))

blender console

>>> test()
user   0.0768065839947667
Vector 0.06031997298123315
Lambda 0.06056222500046715
Numpy  2.192653567995876