加速滑动窗口的平均计算。

I have some data(stock data) and need to manipulate it by making some calculations on that data. I did it with numpy arrays. Numpy is pretty faster than python built-in functions. But, the execution time of my code is higher than expected. My code is in below and I tested it with ipython %timeit function. The result is like this: Total execution time is 5.44 ms, second 'for' loop takes most time 3.88ms and cause for that, is 'np.mean' function in that loop. So, alternatives to 'np.mean' and any other suggestions to speed up execution time would be helpful.I have some data(stock data) and need to manipu