How does jmeter use cache?

[黄吉浩]

I think jmeter does not use cache at all. right?
 
Consider a situation: Web Page is big(many resouces, big pictures. etc) and 
network throughput is limitid or not enough.
How to deal this situation?
- in other test tool, such as Loadrunner, don't check ' clear cache in each 
iteration' option.
- in jmeter, we should record the samplers exclude resources.