If minecraft is not running, no it will not slow your computer down.
If you have a low end or older computer then playing Minecraft may slow it down a little as it's a fairly hardware intensive game. Just give it as much ram as you can and turn the graphic details down until your happy with it.
The Minecraft WiKi has a lot of information on managing the game.
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Having Minecraft on your computer is unlikely to slow it downTrying to run Minecraft andseveralother things at once might thoughIf your computer has little RAm or an older OS or version of Java, Minecraft itself might run slowlyThis can be avoided by changing the video settings to reduce performance
you can't, maybe there is a mod for or something but in default minecraft there are no computers...
It will while the program is running, but after it stops running there will be no change in computer speed.
no you can not
no. playing games will not make your comp slow. If you download a game that takes up alot of member then, probably your computer would get a little slower.