How to speed up read method call of object returned by urllib2.urlopen

I have following code.

 req = urllib2.Request(url,'',txheaders)
 f = urllib2.urlopen(req)
 data = f.read(开发者_Go百科)
 f.close()

In the above code, the read function takes 1-2 minutes when response is of 58KB. How can I make this faster.