I have alot of barks on my site.  Will they slow down my site? Also, how can I easily delete more than one bark?

Good question...I wondered about that too so going to jump on the wagon here and see what reply you get!!!, as far as I know you can only delete one bark at a time, unless its ok to select all and then cut......but I do not know.....best wait until someone with the savvy says how to!!! lol