Optimize Video, Full (Original Size) - What Does It Do?

I've recently noticed that some of the video I've imported into iMovie '09 is "optimized" and some isn't. What's the difference?
Specifically, what does the action "Optimize Video - Full (Original Size)" actually do? If the video can already play in iMovie, and is clearly compatible with it, why does it need optimizing?
Once you optimize a video, you can't de-optimize it, right? It's a one-way street.

There is an advantage to having the optimized video: At least on my computer, it plays significantly more smoothly, and it scrubs better, too. Here's what I found for an 8.1 s clip from my iPhone 4:
Original file: 10.5 MB, 95% CPU when playing.
Optimized Large: 37.6 MB, 51% CPU
Optimized Full: 56.9 MB, 47% CPU
With the original file, the viewer is jerky when it's playing, and the red scrub bar has trouble keeping up with the mouse. With the two optimized, the viewer is smoother (but not perfect), and the scrub bar keeps up with the mouse pretty well.
I don't understand why the original is so jerky in iMovie when it plays perfectly in QuickTime. I've always had problems with jerky video in iMovie.
I will also mention another point of interest: I have compared video from my iPhone 4 with video from my Sony HDR-HC5 HDV video camera, a pretty decent HD camera that records on mini-DV tapes. I was surprised to find that the iPhone video is markedly sharper. It really looks significantly better. I will probably be taking more video using my phone now, instead of always lugging around the video camera.
Downsides to the iPhone video: Not as good in low light. Terrible orange hue in incandescent light (some posters have claimed this might be a defect, as not all phones seem to have this). "Rolling shutter" artifacts. Hard to hold steady, and worries about dropping it since it has to be held in an awkward way.
Still, it'll be great to always have a high-quality (in outdoor light, at least) video camera close at hand.

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Where is the optimize video for iMovie 10??

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1. Split days as new event
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Please tell me where I can find the older iMovie 9 to download and install (again, I can't find it in my application folder), or tell me where I can find those options in the new versions.
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I agree but it's not there...
I know what it should do but the reality is something else at this point.
Any other suggestions?
Do you know if iMovie 10 just imports at the highest possible resolution? I don't know why iMovie 9 had the option and now the new one doesn't...
Tx

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Help! I "optimized video" to "original full size" and...

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Thank you very much. Bruno

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The NEW macbook Pro and Air are EXTREMELY close in form factor
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both have permanent RAM, no superdrive
both are slim profiles and SSD
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....and of course the retina display
both are now "very good for travel"
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http://www.youtube.com/watch?v=oDqJ-on03z4
http://www.anandtech.com/show/7113/2013-macbook-air-core-i5-4250u-vs-core-i7-465 0u/2
I5 vs. I7 performance 13” Macbook Air 2013
Boot performance
11.7 I5 ……11.4 I7
Cinebench
1.1 I5….1.41 I7
IMovie Import and Opt.
6.69 I5….5.35 I7
IMovie Export
10.33 I5…8.20 I7
Final Cut Pro X
21.47 I5…17.71 I7
Adobe Lightroom 3 Export
25.8 I5….31.8 I7
Adobe Photoshop CS5 Performance
27.3 I5…22.6 I7
Reviews of the newest Retina 2013 Macbook Pro
13”
Digital Trends (13") - http://www.digitaltrends.com/laptop-...h-2013-review/
LaptopMag (13") - http://www.laptopmag.com/reviews/lap...play-2013.aspx
Engadget (13") - http://www.engadget.com/2013/10/29/m...-13-inch-2013/
The Verge (13") - http://www.theverge.com/2013/10/30/5...ay-review-2013
CNet (13") - http://www.cnet.com/laptops/apple-ma...-35831098.html
15”
The Verge (15") - http://www.theverge.com/2013/10/24/5...w-15-inch-2013
LaptopMag (15") - http://www.laptopmag.com/reviews/lap...inch-2013.aspx
TechCrunch (15") - http://techcrunch.com/2013/10/25/lat...ok-pro-review/
CNet (15") - http://www.cnet.com/apple-macbook-pro-with-retina-2013/
PC Mag (15") - http://www.pcmag.com/article2/0,2817,2426359,00.asp
Arstechnica (15") - http://arstechnica.com/apple/2013/10...-pro-reviewed/
Slashgear (15") - http://www.slashgear.com/macbook-pro...2013-26303163/

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Proceed further only if the problem isn't solved by the above steps.
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Back up all data now.
If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
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☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Paste into the Terminal window by pressing command-V. You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator. Ignore any other messages that appear in the Terminal window.
The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with the app, quit it and also quit Terminal.

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x

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Optimize Video, Full (Original Size) - What Does It Do?

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