by 
The Curious Bag
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<h4 class="dechead">On One Hand: QuickTime Slows Down Computers
The QuickTime movie player program has a tendency to slow down computers, especially PCs. The program uses about 10MB of system RAM; while this is not a very large amount, it does technically slow down a computer.
On the Other: QuickTime is Worth It
QuickTime is one of the best movie players on the market, offering crisper audio and video quality than nearly any player on the market. While the amount of RAM use will slow down your computer slightly, if you watch a lot of videos on your computer, it will probably be worth it.
Bottom Line
The fact is that QuickTime, as a program, does slow down your computer. However, if you have a large amount of RAM available--more than enough to handle QuickTime--or you don't notice the program slowing down your computer, the benefit of having it available to view video may outweigh the downside.
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