Having minecraft on your computer is unlikely to slow it down
Trying to run Minecraft andseveralother things at once might though
If your computer has little RAm or an older OS or version of Java, Minecraft itself might run slowly
This can be avoided by changing the video settings to reduce performance
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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.
No, not at all. It requires no Downloading.
It will while the program is running, but after it stops running there will be no change in computer speed.
I have played without downloading it before... probably no. It takes like 10 seconds to download even on a slow computer
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.