Slow Video

Does Anybody Knows How To Fix This Problem ?

THIS IS A QUICK EXAMPLE :

I DOWNLOAD A VIDEO FROM YOUTUBE . I´M WORKING WITH MANY VIDEO FORMATS .
ALSO USING THE SHIFT HSV MODULE .
JUST TESTING FEW THINGS TO GET STARTED .

I REALIZE THAT EVERYTIME I USE THE WRITER EX9 TEXTURE AVI THE VIDEO JUST GET SLOW . WHY IS THAT ?

A WEEK AGO I WORKED VERY WELL BUT NOW IS GETTING SLOW AND IS REALLY UNCOMFORTABLE .

HOW CAN I SOLVE THIS PROBLEM . I´M WORKING ON MY LAP TOP RUNNING IN VISTA …

ANY SUGGESTION IS VERY WELCOME .

ALSO WANTS TO THANKS TO ALL VVVV CREW AND USERS FROM AROUND THE WORLD .

CHEERS FROM MÉXICO !