Resources Of 'Chat' Plugin Help!

Hi guys, I maybe barking up the wrong tree here, and if so I apologize, but unless I manually archive or delete the transcripts from the chat plugin frequently. then the amount of posts will get very large, right?

I assume that each chat post is stored in a mysql database table. So my question is, if members of my buddypress community frequently access my chat page, then the plugin has to pull all posts since it was last cleared or archived.

If this correct, won't this be a massive hit on my servers resources or am I missing something here?

Please advise?