We'll need a lot more information to be able to help you.
Which version of the program are you using on what operating system?
How long is your movie?
What processor do you have with how much RAM?
Have you tried uploading your videos at a different time of day, when there is less internet traffic?
I don't know of any settings that will slow down your video upload. You can turn them off or you can turn them on -- but there's not a setting that makes your videos upload more slowly. There's something else going on with your system or internet connection.