I downloaded some asf clips. I use easy video joiner to join them together. when i play the whole movie, there is a hesitation. It goes in slow motion then picks up again. It sucks. It happens where the clips merge together.

how do i fix this?

You are in breach of the forum rules and are being issued with a formal warning. Please don't post the same question in more than one forum.
/ Moderator vitualis