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Digital Foundry did a great technical analysis of Doom.

http://m.youtube.com/watch?v=la0O0SyM3gg

Note: that is for Doom 4, not Doom 1

Watching it now. Thanks for the link. I love a good tech analysis

Shameless plug: https://www.reddit.com/r/TheMakingOfGames/

Good point. In a world of 30-fps-locked games, a game that is engineered to run with your framerate just feels right, even if you're "only" playing at 60Hz.

But that means the voices get out of sync during cinematics if your fps is too low

Not if the cinematics are synced to a global timer instead of the frame rate. Then when the frame rate is too low the game skips some frames to keep up.

No, the game uses frame delta times rather than a set tick rate per second.

(In general it's how most games already work; it's just that it's normally convenient to set it at a fixed rate to make some things like physics more deterministic, and it gives a nice target performance/budget).

What's your computer's spec?

I've actually been playing on Xbone lately.