Choppy movie play back-everything working slow!!!

I have an external hard drive, lots of space, but with only about 35 min of video in my I-movie 4 program I am getting a choppy playback that skips along without smooth play! I have the playback set to the standard setting (Smooth Playback) and still it does not help. Also I get a 30 second lag time with the color wheel spinning every time I try to do anything! But at one point all of this stoped, and the clips and transitions went right in with no lag time at all! Then for no reason it started lagging again! And it seems the longer I went adding clips and transitions, the playback choppyness kept getting worse! I also noticed at one point the green bar at the bottom that shows avalible space had changed! Insted of one solid bar it had all of a sudden become 2 short green bars with a space in the middle! What's with that? I am adding transitions between all my clips,could this be overloading the program? My experience in the past is that this all goes away when I burn the movie, but I can't check it now without all these problems! What do I do?
Any help would be great...Thankyou

Thanks for your reply Mike!
I am running an IMac with Mac OS X
It has 768 MB SDRAM
The external hard drive is a ULTRA brand, capacity 232GB, available 186GB.
It is on a fire wire, 400MB/sec. speed with the only other imput being the wire to camera. So both do not get used unless I am importing video!
I have about 258MB of ram free, 78MB wired, 138.5 active (With AOL up, and a few others!) and 293.5 inactive! A total of 510.18 used. So 258MB free! Is that not enuff to run smooth? I also consolidated all decktop items to one folder and made sure no other programs were running.
I put the I-movie program on the external hard drive in the hope of saving space on the computer. But then I had the problems. So I put the program back on my desktop and ran it from there and I still had the same problem with playback and 10-20sec lag for each click. So i don't think it's the firewire! But I burned the movie I made so far just to see what happend and it plays fine. This would leave me to think it's in the comp!
So my next questions are...
1) Should I keep the I-movie program on my desk top or shouldI keep it on the external.(Because I though that's what the external was for,saving big usage items!)
2) Since I have the problem with the program on my desktop and the external drive both, does this mean the source is my computer!
3) A friend asked about the video card I have. Would that have anything to do with it?
This is very frustrating for me because the farther along I get, the worse the lag and playback problems get. It seems like a memory/avalable space issue causing my comp. to skip fames because it's to slow!?!? I don't know. When I was using final cut pro I just kept my scratch disc on the external drive and the program on my desktop. I see no way to do that with I-movie! Let me know what you think!
Thanks again for any help,
Bill

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