Exporting on Quicktime slows computer down.

Even with 4 GB RAM, and 3.06 GHz Intel Core 2 Duo, simply exporting a few Quicktime videos slows the computer to a crawl, even with very few stuff being open....
0:00Processes: 52 total, 6 running, 46 sleeping, 259 threads
Load Avg: 5.48, 4.39, 3.60 CPU usage: 97.8% user, 2.91% sys, 0.0% idle
MemRegions: 8515 total, 625M resident, 17M private, 206M shared.
PID COMMAND %CPU TIME #TH #WQ #POR #MRE RPRVT RSHRD RSIZE VPRVT VSIZE
315- QTPlayerHelp 50.1 01:29.97 9/1 1 153 483 96M 30M 102M 164M 1421M
312- QTPlayerHelp 57.2 01:36.80 9/1 1 153 494 98M 30M 104M 166M 1423M
310- QTPlayerHelp 53.0 01:46.06 10/2 2 155 496- 99M- 30M 105M- 158M- 1415M-
Is there any thing that can be done to keep the iMac from turning in to a slug during the exporting?

I've had quite a few windows computers that I have installed QT in fact 4 since last winter and have never expierenced any slow down.

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Exporting is very slow

Hi,
I bought a refurbed MacBook Pro from Apple Store, (incl apple care)
2.33 Ghz Intel Core 2 Duo
I was told that I could extend the Ram to 4 Gig Ram but I would not get the full performance from the 4 Gig Ram, but it would be better than the 2 I had and better than extending to 3 Gig Ram.
I bought the Ram from Crucial.com
Didn't really notice much difference in edit, but I was recently away on a job where we had to export our time lines to QuickTime - Broadband Medium, which a graphic on top of our work.
Each timeline was about 1-2mins long.
My exports where taking between 5-7mins where as collegues where exporting in half the time.
My computer in general had been slow so I reinstalled, first MacBook Pro discs, then OSX 10.5 did all the upgrades, then installed FCP latest version, did the updates.
Still slow!
Is this a ram thing or just a slow computer?
Will Mac replace it if it is slow?
Lastly, I can't find my apple care receipt, but I know I registered the mac online, where do I find where it is registered?
Please help. I have another job starting next week, same sort of gig. We have to provide a lot of content for the web and I am slowing down the work flow.
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Jamie
PS One last thought, could it be the external drive the work is stored on. G-Raid drive connected to FW 800. I doubt it?

Jamie.
For what its worth, the 2.33GHz Core 2 Duo model of the MacBook Pro did not support 4 GB of RAM. It would only support 3, but even with the mismatched pair, performance wasn't improved that much. So the 2.33GHz model will work best with 2GB of RAM.
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Exporting on Quicktime slows computer down.

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