为什么手动 socket 连接 web 服务器比浏览器慢了这么多？？

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我的网速还可以，用浏览器打开测试网页在一两秒全部加载完毕。
但是我用 socket 转发浏览器的请求，从 socket.sendall ()结束开始算起，到 recv 完毕，花费的时间却数十倍于浏览器：

using 60.132000s get receive from: cdn.v2ex.com
using 46.560000s get receive from: zone.wooyun.org
using 30.46000s get receive from: sjs.sinajs.cn
using 30.76000s get receive from: i.sso.sina.com.cn

请问这是怎么回事？我的 socket 写的有问题还是浏览器有什么特别的技巧？

相关代码在下面，略去无关代码：

def recv_basic (the_socket ):
    total_data=''
    while True:
        data = the_socket.recv (2048 )
        if not data: break
        total_data+=data
    return total_data

# ...send codes...

t1 = datetime.datetime.now ()
data2reply = recv_basic (remote )
t2 = datetime.datetime.now ()
print 'using ', str ((t2 - t1 ).seconds )+'.'+str ((t2-t1 ).microseconds ), 's get receive from:' , remoteAddr