Slow operation of Macbook Pro

I use FCP on my macbook pro i5, 4gb ram. having more than 200 gb hd free space, the macbook slows down all its operations when I use fcp. generally also it works at a slower speed than what it should work previously. Can someone please let me know ast to how to solve this problem?

G'day and welcome to the forums.

Turn off audio wave. Have a read of this:-

https://discussions.apple.com/thread/3133722?start=15&tstart=0