Seems like when I import them to media100hd it took longer than capturing video through HDMI. I thought that if I import the files instead, it will be quicker. Is that right?
Sure. It should be quicker than real-time to import files.
Are you importing them from a reader or a camera? Sometimes importing from a camera creates issues. Maybe try copying it to your HD somewhere first. Hopefully copying them to your local drive won't take longer than real-time.