I don't see what you're complaining about. Those original shots look fine. I didn't have any trouble seeing things in those conditions. You're supposed to be on a ruined base on fucking Mars. If a burning pit to Hell opened, do you really think that everything would still stay at full power and completely lit, just for your benefit?
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It isn't a processor-related issue at all - it's an entirely seperate animation from what's actually happening.
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Learn more about programming before talking about what is and isn't a processor-related issue. More animations mean more CPU speed is required to make everything happen fast enough for you not to notice. That delay is caused by the same reason why it can take up to a minute to load a new level or the game pauses for a second when you enter a new room.
The chainsaw works differently than it did in the previous Dooms. You have to move around with it and run into the bad guys. Holding fire and standing there won't damage anything, because a lot of the monsters have reach and don't charge blindly into the sawblade; they're smart enough to avoid it. I was confused by that to begin with, too, until I figured out how to use it.