NSURLConnection Response time

Hi,

Is there any way that, response time for a http call can be minimized to any lower extent, to be clear are there any advanced concepts through which, http connections can be made faster response.

Either server side or on iphone would be helpful as per my requirement.

till we had done :

replaced xml with JSON content
gzipping the content over the server side..

Any more would be greatful.

Regards
Pramod Jain.