FCPX Slow, can't edit properly
I have Final Cut Pro X, running on Mac OS X v 10.7.5 Processor 2.26 GHz Intel Core 2 Duo. Memory 1GB 1067 MHz RAW. Is there any settings I can choose on FCPX to speed it up, the problem I am having is that when I want to watch what I've edited it lags, so I don't have smooth playback to view the video.
Would buying a bigger ram change this? or are there settings on FCPX I can change to help.
Thanks
Final Cut Pro X, Mac OS X (10.7.5)