Проблемки с производительностью

import pyopencl as cl
import numpy
import sys

class CL(object):
    def __init__(self, size=10):
        self.size = size
        self.ctx = cl.create_some_context()
        self.queue = cl.CommandQueue(self.ctx)

    def load_program(self):
        fstr="""
		__kernel void part1(__global float* a, __global float* b, __global float* c)
		{
       		unsigned int i = get_global_id(0);

	       c[i] = a[i] + b[i];
		}
	     """
        self.program = cl.Program(self.ctx, fstr).build()

    def popCorn(self):
        mf = cl.mem_flags

        self.a = numpy.array(range(self.size), dtype=numpy.float128)
        self.b = numpy.array(range(self.size), dtype=numpy.float128)

        self.a_buf = cl.Buffer(self.ctx, mf.READ_ONLY | mf.COPY_HOST_PTR,
                               hostbuf=self.a)
        self.b_buf = cl.Buffer(self.ctx, mf.READ_ONLY | mf.COPY_HOST_PTR,
                               hostbuf=self.b)
        self.dest_buf = cl.Buffer(self.ctx, mf.WRITE_ONLY, self.b.nbytes)

    def execute(self):
        self.program.part1(self.queue, self.a.shape, None, self.a_buf, self.b_buf, self.dest_buf)
        c = numpy.empty_like(self.a)
        cl.enqueue_read_buffer(self.queue, self.dest_buf, c).wait()
        print "a", self.a
        print "b", self.b
        print "c", c

if __name__ == '__main__':
    matrixmul = CL(10000000)
    matrixmul.load_program()
    matrixmul.popCorn()
    matrixmul.execute()

def add(size=10):
    a = tuple([float(i) for i in range(size)])
    b = tuple([float(j) for j in range(size)])
    c = [None for i in range(size)]
    for i in range(size):
        c[i] = a[i]+b[i]

    #print "a", a
    #print "b", b
    print "c", c[:1000]

add(1000000)

real 10.76
user 9.21
sys 1.47

real 2.30
user 2.11
sys 0.18