It depends. As a Roblox player myself, it has not done much. But, if you have a old, slow, or/and defective computer it may.
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I have played without downloading it before... probably no. It takes like 10 seconds to download even on a slow computer
If your computer can handle all the Java and updates, you're fine. If your computer can't it might get slower.
It will while the program is running, but after it stops running there will be no change in computer speed.
It is slow because every time a new competition is there is slows it down or you could have a virus on you laptop/computer and you need to get it fixed ♥♥♥
Yes, because why you download it on the wedsite or store it contains lots of storage in order to run because you have to download it. It makes the pc run slow and can make your lifespan of a computer or laptop shorter and kills its battery.