My web-site constantly has updates to it. When I go to the page, the updates arnt visible until I hit refresh. This is not good for my returning visitors, they may miss important information.

Two questions

1.) How do I make the page refresh every time they visit it only once when the page opens.

2.) Will this make the load time for the page slower, since it may clear the cache of the viewers internet browser.

3.) Is there a way I can refresh the page, without a full refresh (shift+refresh) just so they can see page updateS?