unless a computer is downloading torrents somewhere, which saps all of your bandwidth by default.... theres nothing you can do.
That is TERRIBLE bandwidth. You're going to lag regardless of what you do because theres simply not enoug bandwidth to go around.
you need a better ISP
that results is proof of what I said on my first post on this thread. You need better internet speeds, specially upload speeds.
Face the fact that is right in front of you many time over on this thread, you need to upgrade your internet speeds.