Problems with a large video library - any ideas on speeding up opening?

One of the things I really like about iMovie is that it is the best tool I've found so far for managing my large and rapidly growing collection of home video. The raw clips are all nicely organised by event and date, and where I have taken the time to produce an edited movie, this is also easily accessible by name and date.
My problem is that with getting on for 500GB of media in my Events Folder, opening iMovie can now be a 10 minute task, as it seems to need to Optimize and Process the Events even if nothing new has been added since the last time it was opened. There must be some sort of cache though, since if you wait for it to finish processing the events, closing and immediately reopening iMovie happens very quickly.
I assume the cache is getting flushed regularly to free up space. Does anyone know if there is a way to stop this happening, or offer another explanation/work around?

Assuming there is nothing wrong with your computer, maybe iMovie just has too much to open as you say.
If you are done using the majority if your events in your projects, you could move them to an external HD disk. Then if that disk is not on/connected at the time you open up iMovie it will not have to go through them to open up. To do this, do an iMovie Help Search using "move events to external" and find the topic "Copying or moving video from your event library to and external hard disk". The events will be there anytime you need them and will show up in iMovie when that HD disk is hooked up and on and iMovie open. You dont have to move them all, just the large ones you are not using. You have the option of moving or copying them to the HD, you want to move them. Moving them deletes then from your main HD so you may want to be backed up first... This way iMove (With external HD not connected) only now has to open up a lot less video.
The other possibility is to just back up all events pre-thinning, then thin the events on your HD, by either choosing " Move rejected clips to trash" or by "Space saver". if you go to this old post i wrote a description of the difference between the two options, they both work but are different.
http://discussions.apple.com/thread.jspa?messageID=11164511&#11164511
roger

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