Having trouble rendering my stuff to 10 MB or under, don't know how long this will take...

Made my first video with youtube HD in mind, after I did that I remembered about newgrounds and how many awesome cartoon series came from here, so I wanted to post my stuff here as well. I ran into a problem when I seen the 10 MB limit. Slowly but surely I'm making the file smaller and smaller without losing too much quality... Tough not used to it.